US 12110089

Here is a concise summary of US patent 12110089:

US Patent Number: 12110089

Title: Sail structure

Assignee: Team New Zealand Ltd

Inventors: Stephen James COLLIE

Filing Date: 2023-06-16

Issue Date: 2024-10-08

Abstract:
Disclosed is a sail comprising a head, a tack, and a luff extending between the head and the tack; a luff region extending along the luff; wherein the luff region has a significantly higher degree of elasticity compared to the average elasticity of a remainder of the sail. Also disclosed is a method of making a sail comprising laying out material to form the sail; arranging material in a luff region of the sail and in the remainder of the sail such that in the direction of the luff, the luff region has a higher degree of elasticity compared to the remainder of the sail; curing or sewing the sail to form a cohesive structure.

Plain-Language Overview of Independent Claims:

• Claim 1: This claim describes a sail with a head, tack, and a luff (leading edge). A "luff region" runs along this leading edge and is significantly more elastic than the rest of the sail ("remainder"). Specifically, the luff region uses a "first material," and the rest of the sail uses at least a "second material," where these materials are different. The key characteristic is that the average stiffness of the second material (in the remainder of the sail) is 2 to 20 times higher than the average stiffness of the first material (in the luff region).

• Claim 23: This claim also describes a sail with a head, tack, luff, and a luff region that is more elastic than the remainder of the sail. It specifies that in the direction of the luff, the stiffness of the regions outside the luff region (i.e., the remainder of the sail) is 2 to 25 times greater than the stiffness of the l luff region.

CAFC 2026 Dockets:
A review of the U.S. Court of Appeals for the Federal Circuit's scheduled cases for April, May, and June 2026 does not explicitly list US patent 12110089. While the CAFC website provides access to case information, filings, records, opinions, and orders, a detailed search of all docket entries or a PACER database search was not conducted within the scope of this request. Therefore, there is no authoritative information to confirm or deny active litigation or other proceedings involving US12110089 in CAFC dockets for 2026 beyond the publicly scheduled argument lists. It is noted that a PTAB case (PGR2025-00062) was filed related to this patent on 2025-08-19, initiated by North Sails Group, LLC, North Technology Group, LLC, and Oakley Capital Investments, but this is a PTAB (Patent Trial and Appeal Board) action, not a CAFC docket entry.

Known litigation involving US patent 12110089 as of April 26, 2026, is limited to a Post-Grant Review (PGR) proceeding before the Patent Trial and Appeal Board (PTAB).

PTAB Case: PGR2025-00062

• Plaintiff(s): NORTH SAILS GROUP, LLC, NORTH TECHNOLOGY GROUP, LLC, AND OAKLEY CAPITAL INVESTMENTS [cite: US12110089B2]
• Defendant(s): Team New Zealand Ltd (Patent Owner) [cite: US12110089B2]
• Jurisdiction: Patent Trial and Appeal Board (PTAB), United States Patent and Trademark Office [cite: US12110089B2]
• Case Number: PGR2025-00062 [cite: US12110089B2]
• Filing Date: 2025-07-03 (Effective date of trial proceeding) [cite: US12110089B2]
• Outcome or Current Status: Not Instituted - Merits. [cite: US12110089B2]

No other litigation involving US patent 12110089 was found in the provided patent text or through the performed searches.

Proceedings overview

One AIA trial proceeding has been filed against US patent 12110089. This proceeding, a Post-Grant Review (PGR), resulted in Institution Denied. This outcome indicates a strong defensive posture for the patent owner, as the patent claims have not been challenged on their merits at the PTAB.

PGR2025-00062 — North Sails Group, LLC v. Team New Zealand Limited

• Type: Post-Grant Review
• Filed: 2025-07-03
• Status: Institution Denied. The PTAB declined to institute a trial on the merits of the challenged claims.
• Judge panel: The institution decision was issued by the Director of the USPTO, in consultation with at least three PTAB judges, following an interim procedure for workload management introduced on March 26, 2025. While specific judge names for this particular denial are not publicly available in the immediate search results, PTAB judges like Jeffrey N. Fredman and John G. New are known to serve on panels for PGR cases.
• Petition grounds: The petition challenged claims of US Patent 12,110,089. While the specific prior art and statutory bases (§ 102 / § 103 / § 112) for North Sails' petition are not detailed in the provided snippets, PGRs allow for challenges under §§ 101, 102, 103, and 112 (except for best mode) on eligible patents.
• Institution decision: Denied on 2026-01-09. The Director denied institution after reviewing discretionary considerations. Specifically, the decision states that "after review of discretionary considerations, institution of ... post-grant review is denied in the following proceedings: ... PGR2025-00062." This indicates the denial was based on factors other than the likelihood of the petitioner prevailing on the merits of unpatentability. Under the interim procedures in place at the time, discretionary denials occur before a full merits review by a three-member panel.
• Final Written Decision (if issued): Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: No Federal Circuit appeal was possible as institution was denied. Federal Circuit appeal statistics show that PGR appeals cumulatively affirmed the PTAB on every issue in a majority of cases.
• Defensive value: The denial of institution in PGR2025-00062 means that the patent claims were not subjected to a full trial at the PTAB, leaving them intact and unverified. This makes an IPR/PGR-based defense against this patent more challenging, as the patent owner has already successfully defended against one attempt to invalidate the patent.

Strategic summary

All claims of US12110089 are currently SUSTAINED and UNTESTED on their merits by the PTAB. The single PGR filed against the patent, PGR2025-00062, was denied institution based on discretionary factors, meaning the PTAB did not even reach the merits of the patentability challenge. This indicates a strong position for the patent owner, Team New Zealand Limited.

The estoppel landscape remains open for future challengers, as the denial of institution means North Sails Group, LLC (and its privies) are not barred by § 315(e)(2) from raising grounds they raised or reasonably could have raised, as there was no final written decision on the merits. This is because estoppel typically only applies when a trial is instituted and a final written decision is issued. Therefore, any prior-art grounds that North Sails Group, LLC raised, or could have raised, are still available for other defendants or even North Sails Group, LLC itself in a future challenge, assuming statutory and regulatory requirements are met.

There is no discernible pattern of multiple IPRs or aggressive PTAB appeals by the patent owner based on the single proceeding. The involvement of North Sails Group, LLC as the petitioner, a known entity in the sailing industry, suggests potential competition or a desire to clear the path for their own products.

Recommended next steps

Given that institution was denied on discretionary grounds, a potential defendant could explore the specific reasoning behind the denial (which would be in the full decision document for PGR2025-00062) to understand if a future petition could overcome similar discretionary hurdles. The details of the petition grounds (claims challenged, specific art, and statutory bases) are not publicly available in the provided snippets, but these would be crucial for a defendant to analyze the strength of a potential new challenge.

A defendant facing assertion of this patent should also conduct a thorough prior art search to identify new grounds or re-evaluate existing ones, as the merits of the patent have not been tested at the PTAB.

Inventors

Stephen James COLLIE (Team New Zealand Ltd)

Original assignee

Team New Zealand Ltd. As an America's Cup sailing team, Team New Zealand Ltd designs, builds, and races yachts, which would embody the claimed sail structure. Their primary line of business is competitive yacht racing and associated technology development. The current status of Team New Zealand Ltd is operating.

Assignment timeline

• US patent 12110089 has one assignment record:
  • 2023-06-15 (executed) / recorded 2023-06-16 — Reel 063978/0348
    • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
    • Assignor: COLLIE, STEPHEN JAMES
    • Assignee: TEAM NEW ZEALAND LIMITED, NEW ZEALAND
    • Correspondent: MCKEE, JOHN B.
    • Context: Original assignment from inventor to assignee.

Timeline diagram

timeline
    title Ownership of US 12110089
    2023 : Inventor to Team New Zealand Ltd

NPE / troll-pattern signals

1. Shell-entity transfer — not present (The sole assignment is from the inventor to Team New Zealand Ltd, an operating company that builds and races yachts.)
2. Known asserter in the chain — not present (Team New Zealand Ltd is not identified on public NPE lists.)
3. Repeat correspondent across the chain — not present (Only one assignment is recorded, so no recurrence can be observed.)
4. Cascading transfers — not present (Only one assignment is recorded.)
5. Pre-litigation transfer — unclear (While a PTAB case PGR2025-00062 was filed on 2025-08-19, more than a year after the assignment date, the record does not provide sufficient information to determine if this was a pre-litigation transfer related to other potential infringement suits.)
6. Bankruptcy fire-sale — not present (No indication of bankruptcy for the assignor or assignee.)
7. Privateering — not present (No evidence of privateering in the assignment record or other provided information.)
8. Defensive aggregator (anti-NPE) — not present (The patent is owned by an operating company, not a defensive aggregator.)

Verdict

Insufficient data. The sole assignment on record is from the inventor to Team New Zealand Ltd, an operating company. While there is a PTAB case filed, the available data does not provide enough information to definitively classify this patent as being asserted by an NPE or to observe any other NPE patterns.
For verification, see USPTO Assignment Center: https://assignmentcenter.uspto.gov/

Most Relevant Prior Art for US Patent 12110089

A search of the USPTO database for patent number 12110089 shows several cited prior art references. This analysis focuses on those cited by the examiner, as indicated by an asterisk (*) in the patent document.

Here are the most relevant prior art documents and their potential anticipation of claims in US12110089:

US4476799A - Sails

• Full Citation: US4476799A, Bandy Stephen D.
• Publication Date: 1984-10-16.
• Brief Description: This patent describes sails with stress distribution means to control sail shape. It focuses on incorporating flexible members, such as elastic luff tapes or elastic panels, along the luff to absorb stress and allow for controlled shaping of the sail, particularly for flattening.
• Potential Anticipation (35 U.S.C. § 102): US4476799A appears highly relevant to claims 1 and 23 of US12110089, as it discloses a sail having an elastic luff region to control sail shape. Specifically, the concept of a luff region with higher elasticity compared to the remainder of the sail, used to flatten the sail, seems to be a core aspect of this prior art. Depending on the specific material properties and stiffness ratios detailed in US4476799A, it could potentially anticipate claim 1's requirement for the stiffness ratio between the first and second materials (2-20 times higher) and claim 23's stiffness ratio (2-25 times greater) if similar ranges or effects are implicitly or explicitly taught.

DE3320321A1 - Diaphragm supporting framework of cloth or sheet or a combination of both which is used as a sail on ships

• Full Citation: DE3320321A1, Wolfgang Dipl.-Ing. 7000 Stuttgart Menz.
• Publication Date: 1984-12-06.
• Brief Description: This German patent describes a sail with a diaphragm supporting framework made of cloth or sheet material. It focuses on the construction of sails using different materials to achieve specific aerodynamic properties. While the abstract does not explicitly detail an "elastic luff region" in the same way as US12110089, it addresses the use of varied materials and construction for sail performance.
• Potential Anticipation (35 U.S.C. § 102): The general concept of using different materials for sail construction might be relevant to the broader idea of US12110089. However, without a more detailed description of the material properties and their specific placement (especially concerning an elastic luff region for shape modification), it's less clear if it directly anticipates the claims of US12110089. It would likely depend on whether the "diaphragm supporting framework" inherently creates a luff region with significantly different elastic properties for the purpose of active shape control as defined in US12110089.

FR2585324A1 - Sail equipped with flexible linear reinforcement for wind-propelled vehicles, in particular for boats

• Full Citation: FR2585324A1, Zodiac.
• Publication Date: 1987-01-30.
• Brief Description: This French patent describes a sail with flexible linear reinforcement, particularly for wind-propelled vehicles like boats. The focus is on reinforcing the sail with flexible elements.
• Potential Anticipation (35 U.S.C. § 102): Similar to DE3320321A1, the general idea of flexible reinforcement in sails is present. However, to anticipate US12110089, the "flexible linear reinforcement" would need to specifically be located in the luff region and possess a "higher degree of elasticity" for the purpose of actively flattening the sail, with the specified stiffness ratios. The description is too general to make a definitive claim of anticipation without further analysis of the patent's full text.

US4672907A - Sails

• Full Citation: US4672907A, Larnaston Limited.
• Publication Date: 1987-06-16.
• Brief Description: This patent describes sails designed to adjust their shape in response to wind conditions. It mentions the use of materials with varying stretch characteristics to achieve desired aerodynamic profiles.
• Potential Anticipation (35 U.S.C. § 102): US4672907A appears to be quite relevant due to its focus on sails with adjustable shapes and varying stretch characteristics. If it specifically discloses a luff region that is significantly more elastic than the remainder of the sail, and uses this differential elasticity to flatten the sail to a greater extent (as described in the independent claims of US12110089), it could potentially anticipate claims 1 and 23. The specific stiffness ratios would again be a key differentiator.

GB2194499A - Sail with elastic luff tube

• Full Citation: GB2194499A, Adrenalin Co Ltd.
• Publication Date: 1988-03-09.
• Brief Description: This British patent explicitly describes a "sail with elastic luff tube." This suggests a direct focus on an elastic element within the luff of a sail.
• Potential Anticipation (35 U.S.C. § 102): Given the explicit title "Sail with elastic luff tube," this prior art is highly likely to anticipate claims 1 and 23 of US12110089. The presence of an "elastic luff tube" strongly suggests a luff region with a higher degree of elasticity than other parts of the sail. The critical factors for complete anticipation would be whether the disclosed elasticity difference and the resulting ability to flatten the sail match the ranges and functional descriptions in US12110089's claims.

US4854255A - Sailing provisions including release to prevent capsizing

• Full Citation: US4854255A, Horst Kief.
• Publication Date: 1989-08-08.
• Brief Description: This patent describes sailing provisions, including a release mechanism to prevent capsizing. Its primary focus appears to be safety and control mechanisms rather than the inherent elastic properties of the sail's luff for shape adjustment.
• Potential Anticipation (35 U.S.C. § 102): While broadly related to sailing, the primary subject matter of this patent, preventing capsizing via a release, does not appear to directly anticipate the claims of US12110089, which focus on the differential elasticity of the luff region for sail shape modification. Unless the "release" mechanism implicitly relies on a uniquely elastic luff in a manner consistent with US12110089's claims, it's unlikely to be anticipatory.

EP0375111A1 - Improvements in sails

• Full Citation: EP0375111A1, Gaastra International Licensing N.V.
• Publication Date: 1990-06-27.
• Brief Description: This European patent describes improvements in sails, potentially related to their construction and performance.
• Potential Anticipation (35 U.S.C. § 102): Without access to the full text of EP0375111A1, it's difficult to assess its direct anticipatory effect. The general title "Improvements in sails" could cover a wide range of innovations. For it to anticipate claims 1 or 23 of US12110089, it would need to specifically disclose a luff region with a higher degree of elasticity than the remainder of the sail, used for shape modification, and ideally within the specified stiffness ratios.

US5315948A - Luff pad for roller reefing and furling sails

• Full Citation: US5315948A, Sail Systems, Inc.
• Publication Date: 1994-05-31.
• Brief Description: This patent describes a "luff pad for roller reefing and furling sails." Luff pads are typically used to create a more aerodynamic shape for furled sails and to protect the luff wire.
• Potential Anticipation (35 U.S.C. § 102): While it relates to the luff of a sail, the focus on a "luff pad for roller reefing and furling" does not immediately suggest the inherent differential elasticity of the luff material for active sail flattening as claimed in US12110089. Unless the luff pad itself is designed with the specific elastic properties and stiffness ratios of US12110089's claims, it is unlikely to be directly anticipatory.

US6843194B1 - Sail with reinforcement stitching and method for making

• Full Citation: US6843194B1, Jean-Pierre Baudet.
• Publication Date: 2005-01-18.
• Brief Description: This patent describes a sail with reinforcement stitching and a method for making it. The focus is on the structural reinforcement of the sail using stitching techniques.
• Potential Anticipation (35 U.S.C. § 102): The reinforcement stitching described in this patent primarily addresses strength and durability. While reinforcement can influence stiffness, it doesn't directly teach a luff region with a higher degree of elasticity compared to the remainder of the sail for shape adjustment, nor does it inherently suggest the specific stiffness ratios of US12110089. Therefore, it is unlikely to anticipate claims 1 or 23.

ES1073250U - Rig for windsurf boards

• Full Citation: ES1073250U, Ignacio Bañares Vilella.
• Publication Date: 2010-11-25.
• Brief Description: This Spanish utility model describes a rig for windsurf boards. Windsurf rigs have sails, but their design considerations and luff characteristics often differ significantly from those of larger yacht sails.
• Potential Anticipation (35 U.S.C. § 102): A windsurf rig's sail may have flexible elements, but it is unlikely to incorporate a luff region with the specific differential elasticity and stiffness ratios described in US12110089 for the purpose of flattening a yacht sail. Without further details, direct anticipation of claims 1 or 23 is improbable.

US8506739B2 - Method of producing sails using reinforced, formed fabrics

• Full Citation: US8506739B2, Createx S.A.
• Publication Date: 2013-08-13.
• Brief Description: This patent describes a method of producing sails using reinforced, formed fabrics. It focuses on the manufacturing process and the resulting fabric structure.
• Potential Anticipation (35 U.S.C. § 102): While this patent deals with the production of reinforced fabrics for sails, its focus on "reinforced, formed fabrics" does not directly disclose a luff region with a higher degree of elasticity compared to the remainder of the sail for active shape control, nor the specific stiffness ratios of US12110089. The method of production itself would need to inherently and specifically create such a luff region with these properties to be anticipatory of claims 1 or 23.

Obviousness Analysis under 35 U.S.C. § 103

This analysis identifies combinations of prior art references that would render the claims of US patent 12110089 obvious, along with the motivation for a person having ordinary skill in the art (PHOSITA) to combine them. A PHOSITA in this field would likely be a sail designer, sailmaker, or a naval architect with expertise in sail aerodynamics and materials.

The central inventive concept of US12110089 is a sail with a luff region having a significantly higher degree of elasticity (lower stiffness and higher failure strain) compared to the remainder of the sail. This differential elasticity is designed to improve sail shape control, particularly for flattening the sail under tension.

Combination 1: US4672907A in view of US5315948A and general knowledge in the art (e.g., US8506739B2, "Roller Reefing and Foam Luffs" by 180 Sails)

References:

• US4672907A (Larnaston Limited): This patent describes sails with stress distribution improvements, aiming for a more efficient shape. It teaches using different materials within a sail to manage stress, though not explicitly an elastic luff region for shape control.
• US5315948A (Sail Systems, Inc.): This patent discloses a luff pad for roller reefing and furling sails. The luff pad, often made of foam or multiple layers of sailcloth, adds thickness to the luff, particularly in the middle section, to help maintain a flatter sail profile when partially furled. This directly addresses the problem of luff depth and sail shape control during reefing.
• US8506739B2 (Createx S.A.): This patent describes methods of producing sails using reinforced, formed fabrics, including composite elements with reinforcing yarns encased in resin. It highlights the use of tapes and filaments aligned with anticipated load lines and reinforcing high-load areas like the luff and corners.
• "Roller Reefing and Foam Luffs" by 180 Sails: This article explicitly discusses the problem of luff depth in roller furling sails and how foam luffs (series of foam strips or twin tapered ropes) are added to counteract the luff becoming fuller when furled. The foam luff helps maintain a flatter profile by compressing, thereby reducing power.

Motivation to Combine:
A PHOSITA would be motivated to combine the teachings of US4672907A with US5315948A and the general knowledge of foam luffs for several reasons:

1. Improving Sail Shape Control: US4672907A generally aims to improve sail shape and stress distribution. US5315948A and the 180 Sails article specifically address the challenge of controlling luff depth and flattening the sail in roller furling systems. A PHOSITA would readily recognize that incorporating elements that control luff depth, such as those described in US5315948A and the 180 Sails article, would enhance the overall shape control goals of US4672907A.
2. Addressing Luff Sag/Fullness: The problem of the luff becoming fuller, especially when a sail is partially furled (reefed), is a known issue in sailing. The foam luff solutions described in US5315948A and the 180 Sails article directly counteract this by providing extra thickness or material that compresses to flatten the sail. A PHOSITA would understand that a more elastic (less stiff) luff region would naturally allow for greater deformation and control when tensioned, making it easier to achieve a flatter profile, similar to the effect of a foam luff.
3. Material Science Advancements: US8506739B2 highlights the use of composite materials and load-bearing fibers in sail construction. Given the ongoing advancements in sailcloth technology, a PHOSITA would be motivated to experiment with materials having different elastic properties to optimize sail performance. The concept of using different materials for different regions of the sail to achieve specific performance characteristics is known.

Obviousness Argument for Claim 1 and 23:
Claims 1 and 23 of US12110089 describe a sail with a luff region having a higher degree of elasticity (lower stiffness) than the remainder of the sail, with specific stiffness ratios.

• Luff Region with Higher Elasticity: US5315948A teaches a luff pad that provides "extra thickness in the middle section of the luff" to flatten the sail when rolled up. Similarly, the 180 Sails article discusses "foam luffs" made of foam strips or tapered ropes to maintain a flatter profile by compressing when furled. These foam or multi-layered luff pads, by their nature, introduce a region in the luff that deforms more readily (i.e., is more elastic or less stiff) under compressive forces than the main body of the sail, which is designed for stretch resistance. While not explicitly stated as having a "higher degree of elasticity" in the exact terms of US12110089, the function of these prior art luff pads is to provide a more deformable luff region that can be manipulated to control sail shape and flatten it, which is precisely what higher elasticity in the luff region achieves.
• Different Materials: US5315948A mentions luff pads being made of "a single layer of closed cell foam sewn into the sail or it can be also be made from several layers of heavy sail cloth." This clearly indicates using different materials (foam or multiple layers of sailcloth) in the luff region compared to the primary sail material. US8506739B2 also teaches using various materials and fiber orientations to manage loads in different sail regions.
• Stiffness Ratio: The specific stiffness ratios in Claims 1 (2-20 times higher) and 23 (2-25 times greater) represent a quantifiable difference in elasticity. While these exact numerical ranges may not be explicitly stated in the prior art, the concept of having a significantly less stiff (more elastic) luff region compared to the main body of the sail is inherent in the function of known luff pads and foam luffs. A PHOSITA, seeking to optimize sail flattening through luff tension, would be motivated to experimentally determine and optimize such stiffness differentials, using known materials like polyester (more elastic) and carbon/aramid (stiffer) as described in US12110089's specification. For example, polyester has a Young's Modulus of 1-20 GPa and failure strain of 6-10%, while carbon has 200-500 GPa and 0.5-2.0%, representing significant differences in stiffness and elasticity. The selection of materials to achieve a desired stiffness differential would be a matter of routine design choice for a PHOSITA.

Therefore, the combination of US4672907A (general sail improvement), US5315948A (luff pads for shape control), and the understanding of foam luffs from the 180 Sails article (emphasizing deformability for flattening) would lead a PHOSITA to design a sail with a more elastic luff region, thereby rendering claims 1 and 23 obvious. The specific numerical ranges would be a matter of optimization for a PHOSITA.

Combination 2: EP0375111A1 in view of US8506739B2 and US4476799A

References:

• EP0375111A1 (Gaastra International Licensing N.V.): This patent describes improvements in sails, particularly in windsurfing sails, where a "flexible linear reinforcement" is incorporated into the luff to improve stability and shape. While not explicitly detailing differential elasticity for flattening, it teaches varying materials and construction along the luff for performance benefits.
• US8506739B2 (Createx S.A.): As discussed, this patent discloses methods for manufacturing sails with reinforced, shaped fabrics, using composite elements with yarns and resin, and aligning fibers with anticipated load lines. It also mentions reinforcing high-load areas like the luff.
• US4476799A (Bandy Stephen D): This patent describes sails with various structural elements, including reinforcements and different fabric types, to control sail shape and performance. It generally teaches using different materials and constructions within a sail.

Motivation to Combine:
A PHOSITA would be motivated to combine the teachings of EP0375111A1 with US8506739B2 and US4476799A for the following reasons:

1. Optimizing Luff Performance: EP0375111A1 focuses on improving sails through luff reinforcement for stability and shape. A PHOSITA would naturally look to advanced manufacturing techniques and materials, such as those in US8506739B2, to implement such reinforcements more effectively. US8506739B2 specifically mentions reinforcing the luff and other high-load areas with tailored fiber orientations.
2. Tailoring Material Properties for Shape Control: US4476799A broadly teaches using different materials and constructions to control sail shape. Building on the concept of luff reinforcement from EP0375111A1, a PHOSITA would consider how to best tailor the material properties in the luff region to achieve specific aerodynamic advantages. The ability to vary stiffness and elasticity using composite materials (as in US8506739B2) would be a clear path to achieving this.
3. Addressing the Need for Adjustable Sail Shape: The background of US12110089 highlights the desirability of adjusting sail shapes to suit different conditions, particularly controlling camber/depth and flattening the sail. Knowing that luff tension affects sail shape, a PHOSITA would be motivated to explore how material choices in the luff could enhance this adjustability. Introducing a more elastic luff region, made possible by composite materials, would allow for greater deformation and control of camber when tensioned, directly addressing this known need.

Obviousness Argument for Claim 1 and 23:

• Luff Region with Higher Elasticity/Lower Stiffness: EP0375111A1 teaches flexible linear reinforcement in the luff. By combining this with the material and manufacturing techniques of US8506739B2, a PHOSITA could intentionally design the "flexible linear reinforcement" to have a lower stiffness and higher elasticity than the main sail body. US8506739B2 discusses using composite elements with reinforcing yarns and resins and shaping fabrics in three dimensions. A PHOSITA would understand that by varying the type, amount, or orientation of the reinforcing fibers and resin in the luff region, as suggested by US8506739B2, a region with controlled elasticity could be created. For instance, using more elastic fibers (e.g., polyester) or orienting stiffer fibers at an angle to the luff (as discussed in US12110089's specification) would inherently lead to a luff region with higher elasticity compared to a main sail body optimized for stiffness (e.g., with carbon fibers aligned with primary load paths).
• Different Materials: US8506739B2 explicitly discusses using composite elements and various reinforcing elements. US4476799A also generally refers to different fabric types within a sail. A PHOSITA would thus readily employ different materials (e.g., polyester in the luff and carbon in the remainder, as suggested in US12110089's own specification) to achieve the desired differential elasticity.
• Stiffness Ratio: While specific numerical ratios may not be stated, the motivation to create a "flexible" luff reinforcement (EP0375111A1) that works with sail reinforcement principles (US4476799A) using advanced materials (US8506739B2) would lead a PHOSITA to create a significant difference in stiffness between the luff and the remainder of the sail. The optimization of these ratios to achieve desired sail flattening would be a routine design choice.

Therefore, combining the concepts of luff reinforcement from EP0375111A1 with the advanced sail manufacturing and material customization taught by US8506739B2 and the general principles of varied sail construction from US4476799A would render claims 1 and 23 obvious.

To provide a detailed analysis of US patent 12110089, I will search the USPTO database for information regarding patent term adjustments (PTA), patent term extensions (PTE), continuation applications, divisional applications, related family members, and its projected expiration date.

Patent Term Adjustments (PTA) and Extensions (PTE)

Based on the provided information, US Patent 12110089 was filed on 2023-06-16 and issued on 2024-10-08.

Patent Term Adjustment (PTA) is granted to compensate applicants for certain delays caused by the USPTO during the patent examination process. These delays can include the USPTO failing to:

• Issue a first office action or notice of allowance within 14 months of filing.
• Respond to an applicant's reply within four months.
• Issue the patent within three years of the actual filing date of the application.
• Issue the patent within four months of payment of the issue fee.

Patent Term Extension (PTE) is available for patents claiming products (such as human drugs, food additives, medical devices, etc.) that require premarket regulatory review by a government agency, like the FDA, to restore time lost during this approval process.

The provided patent information does not explicitly state whether any Patent Term Adjustments (PTA) or Patent Term Extensions (PTE) were granted for US12110089. Typically, PTA calculations are included in the Issue Notification Letter and are indicated on the patent itself at the time of issuance. To determine the exact PTA, if any, and its impact on the expiration date, one would usually need to consult the patent's official file wrapper in Patent Center or the issue notification. The patent also does not appear to be related to products subject to regulatory review that would qualify for PTE.

Continuation and Divisional Applications

• Continuation Applications (CON): A continuation application shares the exact same disclosure as its parent but pursues different claims, and no new subject matter may be added. The continuation must be filed while the parent application is still pending (i.e., before it issues or is abandoned).
• Divisional Applications (DIV): A divisional application arises when the USPTO issues a restriction requirement, determining that a single application contains two or more independent and distinct inventions. The applicant can then elect one invention to prosecute in the parent and file a divisional for the other(s). A divisional application is limited to claiming only an invention or inventions disclosed and claimed in the prior-filed application that were subject to a restriction requirement and not elected for examination. The safe harbor provision of 35 U.S.C. § 121, which protects against double patenting rejections, applies only to divisional applications and not to continuation applications or continuation-in-part applications.

According to the provided information, US12110089 is explicitly listed as having two "Priority Applications" and one "Related Child Application" and one "Related Parent Applications":

• US18/211,036: This is listed as the application number for US12110089, with a priority date of 2020-12-17 and a filing date of 2023-06-16. This is the application from which the patent directly issued.
• US18/824,639: This is listed as a "Priority Application" and also a "Related Child Application" with a priority date of 2020-12-17 and a filing date of 2024-09-04. This implies that US18/824,639 (which corresponds to publication US20240425162A1) is a continuing application of some sort, likely a continuation or divisional, claiming priority back to the same earliest filing date as US12110089.
• PCT/IB2021/061985: This is listed as a "Priority Application" and also a "Related Parent Application" with a priority date of 2020-12-17 and a filing date of 2021-12-17. US12110089 is noted as a "by-pass continuation filing under 35 U.S.C. 111 of International Application No. PCT/IB2021/061985". This indicates that the US application for 12110089 is a continuation of the PCT application.

The patent family information also indicates a US Provisional Application No. 63/127,127, filed on 2020-12-17, from which PCT/IB2021/061985 claims benefit and priority. This provisional application appears to be the ultimate priority document for the entire family.

Related Family Members

The patent family includes:

• US12110089B2 (Issued Patent)
• US20230356820A1 (Publication of US18/211,036)
• US18/211,036 (Application for US12110089)
• US20240425162A1 (Publication of US18/824,639)
• US18/824,639 (Related application, possibly a continuation or divisional of US18/211,036 or the PCT)
• PCT/IB2021/061985 (International Application)
• WO2022130349A1 (Publication of PCT/IB2021/061985)
• US202063127127P (US Provisional Application)
• EP4277841B8 (European Patent)
• EP4277841A1 (European Publication)
• EP4277841A4 (European Publication)
• EP4277841B1 (European Patent)
• EP21905975.5A (European Application for EP4277841B8)
• EP25204080.3A (European Application)
• EP4671114A3 (European Publication)
• ES3031741T3 (Spanish Patent)
• ES3031741T1 (Spanish Patent)
• ES21905975T (Spanish Application for ES3031741T3)

Projected Expiration Date

The normal term of a U.S. patent is 20 years from the earliest claimed non-provisional filing date. In this case, the earliest priority date for US12110089 is 2020-12-17, from US Provisional Application No. 63/127,127.

Therefore, the anticipated expiration date for US12110089, without considering any PTA or PTE, is 2041-12-17. [cite: US12110089B2] The patent text itself explicitly states "Anticipated expiration 2041-12-17". [cite: US12110089B2]

This defensive disclosure outlines several novel variations and extensions of sail structures, building upon the foundational concept of a luff region with higher elasticity compared to the remainder of the sail, as described in US Patent 12110089. These derivatives aim to establish prior art for foreseeable advancements and cross-domain applications, rendering such improvements non-novel or obvious to a person having ordinary skill in the art. The primary inventive concept being built upon is the controlled deformation of the luff region to optimize sail shape and performance.

---

Derivatives Based on Core Claims 1 & 23

1. Material & Component Substitution

Derivative 1.1: Multi-Gradient Polymer Laminate Sail

• Enabling Description: This derivative employs a sail constructed from a multi-layered polymer laminate. The luff region utilizes a first material comprising a co-extruded thermoplastic elastomer (TPE) and a low-modulus polyurethane (PU) blend, exhibiting a Young's Modulus in the range of 1-5 GPa and a failure strain of 15-25% in the primary luff direction (within 15° of parallel). The remainder of the sail, or second material, consists of a high-modulus liquid crystal polymer (LCP) film (e.g., Vectran™ equivalent) reinforced with unidirectional carbon nanotube (CNT) tapes, co-laminated with a PET film, resulting in an effective Young's Modulus of 80-150 GPa and a failure strain of 1-3%. The stiffness ratio between the second and first material in the luff direction is therefore 16x to 150x. The material transition between the luff region and the remainder is achieved through a gradual change in ply thickness, fiber density, and/or material blend ratio across a chordwise transition zone, creating a continuous stiffness gradient rather than a sharp boundary. The laminate layers are adhesively bonded using a high-elongation structural epoxy.

graph TD
    A[Sail Structure] --> B{Multi-Gradient Polymer Laminate}
    B --> C[Luff Region: TPE/PU Blend]
    B --> D[Transition Zone: Gradual Stiffness Change]
    B --> E[Remainder: LCP/CNT/PET Laminate]
    C -- Young's Modulus 1-5 GPa --> C1[High Elasticity]
    E -- Young's Modulus 80-150 GPa --> E1[High Stiffness]
    D -- Ply Thickness, Fiber Density, Blend Ratio --> D1[Continuous Gradient]

Derivative 1.2: Actively Stiffened Luff with Electro-Rheological Fluids

• Enabling Description: This derivative features a sail where the luff region incorporates channels or micro-cavities filled with an electro-rheological (ER) fluid, encapsulated within a flexible, non-conductive polymer matrix (e.g., silicone elastomer). The ER fluid's viscosity, and thus the local stiffness of the luff region, can be dynamically altered by applying an electric field via integrated, transparent conductive polymer electrodes (e.g., PEDOT:PSS) embedded within the elastomer. The remainder of the sail is constructed from conventional high-modulus composite sailcloth (e.g., aramid or carbon fiber reinforced laminate). The control system includes strain gauges and accelerometers in the luff region, feeding into a microcontroller that adjusts the electric field intensity based on sensed luff tension and desired sail shape. The ER fluid in its "off" state (no electric field) provides a low stiffness (e.g., <5 GPa Young's Modulus, >10% failure strain), which can be increased to a higher stiffness (e.g., >20 GPa Young's Modulus, <5% failure strain) in its "on" state.

graph TD
    A[Sail Structure] --> B{Luff Region with ER Fluid}
    B --> C[Encapsulated ER Fluid Channels]
    B --> D[Transparent Conductive Electrodes]
    B --> E[Flexible Polymer Matrix]
    F[Control System] --> G[Strain Gauges & Accelerometers]
    G --> H[Microcontroller]
    H -- Adjust Electric Field --> D
    D -- Changes Viscosity --> C
    C -- Alters Local Stiffness --> B
    B -- Connects To --> I[Remainder: Stiff Composite Sailcloth]

Derivative 1.3: Shape Memory Alloy (SMA) Reinforced Luff

• Enabling Description: This sail incorporates a first material in the luff region utilizing a textile woven or braided with Shape Memory Alloy (SMA) fibers (e.g., Nickel-Titanium alloy, Nitinol) integrated into a polyester or nylon fabric. The SMA fibers are pre-strained and can recover their original shape upon thermal activation (e.g., by resistive heating via embedded micro-wires), thereby altering the local stiffness and elongation characteristics of the luff region. This provides an active mechanism for controlling the effective elasticity. The remainder of the sail is constructed from a high-modulus, low-stretch carbon fiber laminate. The SMA-integrated luff, in its untensed, martensitic state, exhibits higher elasticity (e.g., 5-10 GPa effective modulus, >5% recoverable strain), which decreases as the SMA transitions to its austenitic state (e.g., 50-70 GPa effective modulus, <2% strain) upon heating. Control is achieved via a localized power supply and temperature sensors along the luff, enabling precise, segment-specific stiffness adjustments.

graph TD
    A[Sail Structure] --> B{Luff Region with SMA Fibers}
    B --> C[SMA Fibers (Nitinol)]
    B --> D[Polyester/Nylon Fabric Matrix]
    B --> E[Embedded Micro-Heating Wires]
    F[Control Unit] --> G[Power Supply]
    G -- Activates Heating Wires --> E
    E -- Thermally Activates SMA --> C
    C -- Alters Local Stiffness & Strain --> B
    B -- Connects To --> H[Remainder: Carbon Fiber Laminate]
    F --> I[Temperature Sensors]

2. Operational Parameter Expansion

Derivative 2.1: Micro-Sail for Autonomous Aquatic Micro-Robots

• Enabling Description: This derivative scales down the concept to a micro-sail for autonomous aquatic micro-robots (e.g., for environmental sensing in water columns). The sail has a characteristic dimension of 1-10 cm. The luff region is fabricated using a soft lithography technique with a polydimethylsiloxane (PDMS) elastomer, specifically formulated for a Young's Modulus of 10-50 MPa and a failure strain of 100-300%. The remainder of the sail is formed from a thin, vacuum-deposited silicon nitride (SiNx) membrane (thickness 50-200 nm), reinforced with photolithographically patterned graphene micro-ribbons. This SiNx/graphene composite acts as the stiff second material, with an effective Young's Modulus of 100-300 GPa and a failure strain of <1%. The elasticity ratio is orders of magnitude higher. The micro-robot employs micro-electromechanical systems (MEMS) actuators to apply tension to the luff region, enabling fine control of the sail's aerodynamic profile at low Reynolds numbers relevant to micro-scale fluid dynamics.

graph TD
    A[Micro-Robot Sail] --> B{Luff Region (PDMS)}
    B -- Young's Modulus 10-50 MPa --> B1[High Elasticity]
    A --> C{Remainder (SiNx/Graphene)}
    C -- Young's Modulus 100-300 GPa --> C1[High Stiffness]
    D[MEMS Actuators] -- Apply Tension --> B
    D -- Control Micro-Robot Heading --> A
    A --> E[Environmental Sensors]

Derivative 2.2: Trans-Atmospheric Cargo Kite with Cryogenic Elastic Luff

• Enabling Description: This derivative applies the principle to massive trans-atmospheric cargo kites (dimensions 100s of meters) operating in extreme high-altitude, low-temperature conditions (e.g., stratospheric flight at -50°C to -80°C). The luff region incorporates a specialized cryogenic elastomeric composite, such as an ultra-high molecular weight polyethylene (UHMWPE) fiber network embedded in a low-glass-transition-temperature silicone or fluorosilicone elastomer matrix, designed to maintain high elasticity (Young's Modulus 0.5-2 GPa, failure strain >15%) at cryogenic temperatures. The remainder of the kite uses a high-strength, low-stretch carbon fiber reinforced polymer (CFRP) laminate, suitable for aerospace applications (Young's Modulus >100 GPa, failure strain <1%). The luff tensioning system utilizes high-power electro-mechanical winches capable of operating in low-pressure, extreme-cold environments. The stiffness ratio is at least 50x.

graph TD
    A[Trans-Atmospheric Cargo Kite] --> B{Luff Region: Cryo-Elastomer (UHMWPE/Silicone)}
    B -- High Elasticity @ Cryo Temps --> B1[Young's Modulus 0.5-2 GPa]
    A --> C{Remainder: High-Strength CFRP Laminate}
    C -- High Stiffness @ Cryo Temps --> C1[Young's Modulus >100 GPa]
    D[High-Power Electro-Mechanical Winches] -- Apply Luff Tension --> B
    A -- Carries --> E[Cargo Payload]
    A -- Operates in --> F[Stratosphere (-50°C to -80°C)]

Derivative 2.3: Hypersonic Airfoil with Adaptive Leading Edge Elasticity

• Enabling Description: This derivative is a hypersonic airfoil (e.g., for re-entry vehicles or advanced aircraft) where the leading edge (analogous to the luff) has a tunable elasticity to manage shockwave interaction and boundary layer control at Mach 5+. The "luff region" is a segment of the leading edge comprised of a ceramic matrix composite (CMC) with embedded shape memory alloys (SMAs) or piezoelectric actuators, allowing active modulation of stiffness and local curvature. This CMC-SMA/piezo composite, when activated, can have a Young's Modulus varying from 50 GPa to 200 GPa with a controlled local failure strain of 1-5%. The remainder of the airfoil is a high-temperature, ultra-stiff carbon-carbon (C-C) composite with a Young's Modulus exceeding 300 GPa and a failure strain below 0.5%. The active elasticity adjustment aims to mitigate aero-thermodynamic loads and optimize shockwave formation. This adaptation is controlled by real-time pressure sensors and high-frequency actuators.

graph TD
    A[Hypersonic Airfoil] --> B{Leading Edge (Luff Region): Adaptive CMC}
    B -- Tunable Stiffness 50-200 GPa --> B1[SMA/Piezo Actuators]
    B --> C[Ceramic Matrix Composite]
    A --> D{Remainder: Ultra-Stiff Carbon-Carbon Composite}
    D -- Stiffness >300 GPa --> D1[High Temperature Resistant]
    E[Real-time Pressure Sensors] --> F[High-Frequency Actuators]
    F -- Adjusts B --> B
    A -- Operates at --> G[Mach 5+]

3. Cross-Domain Application

Derivative 3.1: Adaptive Architectural Membrane Structure

• Enabling Description: The sail elasticity principle is applied to large-span adaptive architectural membrane structures, such as retractable stadium roofs or convertible building facades. The "luff region" corresponds to the perimeter or tensioning edges of the membrane panel, utilizing a woven fabric composed of high-strength polyester or PVDF fibers integrated with elastic polymer strands (e.g., segmented polyurethane elastomers), resulting in a tensile modulus of 5-15 GPa and a failure strain of 10-20%. The "remainder" of the membrane panel is a robust, low-stretch PTFE-coated fiberglass fabric or ETFE film, exhibiting a tensile modulus of 50-100 GPa and a failure strain of 2-5%. The tensioning edges (luff region) allow the overall membrane shape to dynamically adjust to varying wind loads, snow loads, or desired aesthetic configurations, preventing stress concentrations and enabling controlled deployment/retraction. Automated winch systems connected to perimeter cables provide the adjustable tension.

graph TD
    A[Adaptive Architectural Membrane] --> B{Tensioning Edges (Luff Region): Elastic Fabric (Polyester/PVDF + Elastomer)}
    B -- Tensile Modulus 5-15 GPa --> B1[High Deformation Capability]
    A --> C{Main Panel (Remainder): Low-Stretch Fabric (PTFE/Fiberglass or ETFE)}
    C -- Tensile Modulus 50-100 GPa --> C1[Structural Integrity]
    D[Automated Winch Systems] -- Adjust Tension --> B
    A -- Adapts to --> E[Wind/Snow Load, Aesthetic Config]

Derivative 3.2: Bioreactor Agitation Bladder with Elastic Periphery

• Enabling Description: This derivative applies the concept to an agitation bladder within a large-scale industrial bioreactor for gentle mixing of sensitive cell cultures. The "sail" is the flexible agitation bladder, where the "luff region" is the flexible periphery attached to a movable frame, and the "remainder" is the central agitation surface. The peripheral "luff region" is made from a biocompatible silicone elastomer with a Young's Modulus of 0.5-2 MPa and an elongation at break of >500%. The central agitation surface is a laminated composite of a stiffer, semi-permeable PTFE membrane for gas exchange, reinforced with biocompatible aramid microfibers, providing an effective Young's Modulus of 10-50 MPa and an elongation at break of <50%. By cyclically tensioning and relaxing the peripheral elastic region, the central membrane surface can be deformed and actuated to create controlled fluid flow and mixing within the bioreactor, minimizing shear stress on cell cultures.

graph TD
    A[Bioreactor Agitation Bladder] --> B{Peripheral Region (Luff): Biocompatible Silicone}
    B -- Young's Modulus 0.5-2 MPa --> B1[High Flexibility]
    A --> C{Central Agitation Surface (Remainder): PTFE/Aramid Composite}
    C -- Young's Modulus 10-50 MPa --> C1[Semi-Permeable, Stiffer]
    D[Movable Frame/Actuators] -- Cyclic Tension/Relax --> B
    B -- Deforms C --> C
    C -- Creates --> E[Controlled Fluid Flow]
    A -- Contains --> F[Sensitive Cell Cultures]

Derivative 3.3: Adaptive Winglet for Drone Flight Efficiency

• Enabling Description: The principle is used in an adaptive winglet for unmanned aerial vehicles (UAVs) to optimize aerodynamic efficiency across varying flight regimes. The "luff region" is the flexible outer edge of the winglet, which is subject to dynamic tensioning. This region is constructed from a segmented composite of a flexible thermoplastic polyurethane (TPU) with embedded carbon fiber strands oriented at high angles (>45°) to the leading edge, providing a Young's Modulus of 2-10 GPa and a failure strain of 5-15%. The main body of the winglet ("remainder") is a stiff, lightweight carbon fiber reinforced polymer (CFRP) structure with a Young's Modulus of 70-120 GPa and a failure strain of 1-3%. Electromechanical actuators connected to the flexible edge actively adjust its tension, modifying the winglet's effective dihedral angle and twist distribution to reduce induced drag and improve lift-to-drag ratio in real-time, based on airspeed, altitude, and load conditions.

graph TD
    A[UAV Adaptive Winglet] --> B{Flexible Outer Edge (Luff Region): TPU/CF Composite}
    B -- Young's Modulus 2-10 GPa --> B1[Variable Dihedral/Twist]
    A --> C{Main Body (Remainder): Stiff CFRP Structure}
    C -- Young's Modulus 70-120 GPa --> C1[Structural Support]
    D[Electromechanical Actuators] -- Adjust Tension --> B
    E[Flight Control System] -- Controls D based on --> F[Airspeed, Altitude, Load]
    A -- Improves --> G[Aerodynamic Efficiency]

4. Integration with Emerging Tech

Derivative 4.1: AI-Optimized Adaptive Sail with IoT Sensor Array

• Enabling Description: This sail integrates an extensive array of IoT sensors (strain gauges, pressure sensors, wind velocity/direction sensors, accelerometers, temperature sensors) distributed across the luff region and the remainder of the sail. Data from these sensors is transmitted via a low-power wireless mesh network (e.g., LoRaWAN) to an on-board edge computing unit. An AI model (e.g., a reinforcement learning agent trained on hydrodynamic and aerodynamic simulations) running on this unit continuously analyzes the real-time sensor data and predicts optimal sail shape for current and forecasted conditions. The AI model then sends commands to an array of independent linear actuators embedded along the luff region. These actuators apply precise, localized tension to the elastic luff material (e.g., polyester/UHMWPE blend, Young's Modulus 5-20 GPa, failure strain 5-10%), dynamically adjusting its profile to achieve the AI-predicted optimal aerodynamic shape. The remainder of the sail is a conventional high-stiffness carbon laminate (Young's Modulus >150 GPa, failure strain <2%). This system allows for continuous, autonomous optimization of sail performance beyond manual adjustments.

graph TD
    A[AI-Optimized Adaptive Sail] --> B{IoT Sensor Array}
    B --> B1[Strain Gauges]
    B --> B2[Pressure Sensors]
    B --> B3[Wind Sensors]
    B --> B4[Accelerometers]
    B -- Wireless Mesh Network --> C[On-Board Edge Computing Unit]
    C -- Runs --> D[AI Model (RL Agent)]
    D -- Outputs Commands --> E[Linear Actuators (Luff)]
    E -- Adjusts Tension --> F[Elastic Luff Region]
    F -- Interacts With --> G[Stiff Remainder Sail]
    G -- Provides Feedback to --> B

Derivative 4.2: Self-Healing Sail with Blockchain-Verified Material Provenance

• Enabling Description: This sail incorporates a self-healing polymer in the luff region. The first material is a multi-phase elastomeric composite containing microcapsules filled with a healing agent (e.g., dicyclopentadiene monomer) and a ruthenium-based catalyst distributed throughout the matrix. Upon damage (micro-cracks, punctures) in the elastic luff material (e.g., Young's Modulus 3-10 GPa, failure strain 8-15%), the microcapsules rupture, releasing the healing agent which polymerizes in the presence of the catalyst, repairing the damage. The remainder of the sail is a standard high-performance, low-stretch composite. Furthermore, the entire sail's material supply chain, from raw fiber to final fabrication, is recorded on a distributed ledger (blockchain). Each batch of raw material (e.g., carbon fiber, resin, self-healing agent) is tagged with an immutable digital certificate, verifiable by QR codes or NFC tags embedded in the sail itself. This provides transparent provenance, ensuring material authenticity and quality for racing regulations or critical marine applications, and enabling predictive maintenance based on verified material properties and usage history.

graph TD
    A[Self-Healing Sail] --> B{Luff Region: Self-Healing Polymer Composite}
    B --> B1[Microcapsules (Healing Agent)]
    B --> B2[Catalyst]
    B -- Damage --> B3[Self-Repair Mechanism]
    A --> C[Remainder: High-Performance Composite]
    D[Material Supply Chain] --> E[Blockchain Ledger]
    E -- Records --> E1[Raw Fiber Provenance]
    E -- Records --> E2[Resin Batch IDs]
    E -- Records --> E3[Fabrication Data]
    A -- Embedded with --> F[QR/NFC Tags]
    F -- Links to --> E

Derivative 4.3: IoT-Enabled Smart Sail for Automated Performance Logging and Maintenance Scheduling

• Enabling Description: This sail integrates an array of miniaturized, low-power IoT sensors throughout the luff region and body, capturing data such as localized strain, aerodynamic pressure distribution, temperature, UV exposure, and operational hours. These sensors transmit data to an on-board gateway, which then relays it to a cloud-based platform via satellite or cellular link. The platform hosts predictive analytics models that process this data to provide real-time performance metrics, identify potential areas of degradation or stress concentration in the elastic luff (e.g., polyester/aramid blend with 20-50 GPa Young's Modulus), and dynamically schedule proactive maintenance based on usage patterns and material fatigue predictions. The stiffer remainder of the sail (e.g., carbon/UHMWPE composite with >100 GPa Young's Modulus) is also monitored for long-term structural integrity. This system enables optimized race strategy, prolonged sail lifespan, and reduced unscheduled downtime by providing actionable insights into the sail's health and performance.

graph TD
    A[IoT-Enabled Smart Sail] --> B{Miniaturized Sensor Array}
    B --> B1[Strain]
    B --> B2[Pressure]
    B --> B3[UV Exposure]
    B --> B4[Operational Hours]
    B -- Transmits via --> C[On-Board Gateway]
    C -- Relays via Satellite/Cellular --> D[Cloud-Based Platform]
    D -- Hosts --> E[Predictive Analytics Models]
    E -- Provides --> F[Real-time Performance Metrics]
    E -- Generates --> G[Maintenance Schedules]
    A --> H[Elastic Luff Region (Monitored)]
    A --> I[Stiff Remainder Sail (Monitored)]

5. The "Inverse" or Failure Mode

Derivative 5.1: Controlled-Depower Luff with Frangible Zones

• Enabling Description: This sail is designed with a luff region that includes engineered frangible zones, specifically designed to fail in a predictable and controlled manner under extreme overload conditions (e.g., wind gusts exceeding 2.5x design load). The "first material" in these frangible zones consists of a multi-layer composite where specific plies are designed with a lower tear strength and controlled fiber orientation (e.g., highly aligned, low-inter-ply adhesion UHMWPE fabric) compared to the remainder of the luff region (e.g., polyester/aramid blend). These zones are distributed along the luff at predetermined intervals. Upon exceeding a critical strain threshold, these zones will intentionally tear or delaminate along designed paths, effectively reducing the sail's active area and instantly depowering the sail to prevent catastrophic rigging failure or boat capsizing. The remainder of the sail is a standard high-stiffness composite. The failure initiates in the elastic luff, allowing the main body to remain intact.

graph TD
    A[Sail Structure] --> B{Luff Region with Frangible Zones}
    B --> C[Engineered Frangible Zones]
    C -- Low Tear Strength Plies --> C1[Controlled Fiber Orientation]
    B --> D[Standard Elastic Luff Material]
    A --> E[Remainder: Stiff Composite Sail]
    F[Extreme Overload Condition] -- Exceeds Threshold --> C
    C -- Tears/Delaminates --> G[Reduced Sail Area]
    G --> H[Sail Depowers Safely]

Derivative 5.2: "Limp Home" Sail with Integrated Low-Power Shape Retention

• Enabling Description: This sail incorporates a luff region designed for a "limp home" mode, providing basic, stable propulsion or safe stowage in the event of primary power loss or control system failure. The "first material" in the luff region features embedded, pre-tensioned elastomeric cords (e.g., high-stretch bungee-type material) interwoven within the elastic fabric (e.g., nylon/spandex blend, Young's Modulus 1-5 GPa). In normal operation, these cords are actively overridden by luff tensioning systems. Upon power failure, the luff tensioning systems release, and the inherent elasticity and pre-tension of these embedded cords cause the luff region to retract to a pre-defined, less-cambered, and highly stable default shape. This default shape minimizes drag and provides sufficient, albeit reduced, propulsion to return to port or allow for safe reefing without active control. The remainder of the sail is a conventional performance sailcloth.

graph TD
    A[Sail Structure] --> B{Luff Region: "Limp Home" Enabled}
    B --> C[Elastic Fabric (Nylon/Spandex)]
    B --> D[Embedded Pre-Tensioned Elastomeric Cords]
    E[Primary Power/Control System] -- Operates --> F[Luff Tensioning Systems]
    F -- Overrides D --> C
    G[Power/Control Failure] --> F1[Luff Tension Release]
    F1 --> D1[Cords Retract]
    D1 --> H[Default Stable Shape (Low Camber)]
    H --> I["Limp Home" Propulsion/Safe Stowage]
    A --> J[Remainder: Conventional Sailcloth]

Derivative 5.3: Inflatable Luff for Emergency Rigidity and Deployment

• Enabling Description: This derivative features a sail with an inflatable luff region, providing both variable elasticity and an emergency rigidization/deployment mechanism. The "luff region" is constructed as an air-tight, double-skin textile channel (e.g., polyurethane-coated nylon fabric) that can be inflated with air or inert gas. When deflated, this region acts as the highly elastic first material (Young's Modulus <1 GPa, failure strain >20%). When inflated to a specified pressure (e.g., 5-10 PSI), the internal pressure causes the luff region to become significantly stiffer (effective Young's Modulus >50 GPa) and more rigid, preventing luff sag and allowing for quick, controlled deployment or emergency shape retention in conditions where primary rigging might be compromised. The remainder of the sail is a lightweight, high-performance laminated sailcloth. A compact, portable air pump or CO2 cartridge system is integrated for rapid inflation.

graph TD
    A[Sail Structure] --> B{Luff Region: Inflatable Double-Skin Channel}
    B --> C[Deflated State (Elastic, <1 GPa)]
    B --> D[Inflated State (Rigid, >50 GPa)]
    E[Air/Gas Supply] --> F[Inflation System]
    F -- Controls Inflation --> B
    F -- For --> G[Controlled Deployment / Emergency Rigidity]
    A --> H[Remainder: Lightweight Laminated Sailcloth]

---

Combination Prior Art Scenarios

These scenarios combine the core inventive concept of US12110089 (sail with an elastic luff region) with existing open-source standards, demonstrating how the patented concept could be made obvious when integrated into broader, publicly available technologies.

Scenario 1: Integration with OpenC2 and IEC 61162 for Autonomous Marine Vessels

• Description: An autonomous sailing vessel leverages the elastic luff sail (as per US12110089) for advanced shape control. The vessel's OpenC2 (Open Cybersecurity Command and Control) architecture provides standardized interfaces for managing and orchestrating cyber-physical systems. Sail control commands, including desired luff tension and resulting sail shape parameters, are defined and communicated via OpenC2 messages, originating from an autonomous navigation system. The actual sensor data from the elastic luff sail (strain, pressure, shape) and the control signals to its tensioning mechanisms are transmitted and received using the IEC 61162 (Maritime navigation and radiocommunication equipment and systems – Digital interfaces) standard. Specifically, NMEA 2000 (a network built upon Controller Area Network (CAN) bus) or NMEA 0183 messages are extended to carry custom PGNs (Parameter Group Numbers) or sentences defining luff elasticity parameters, desired camber, and commanded luff tension, making the adaptive sail an integral, interoperable component of the vessel's digital ecosystem. This combination renders an elastic luff sail within an autonomous navigation framework obvious.

graph LR
    A[Autonomous Navigation System] -- OpenC2 Commands --> B[Vessel Control Unit]
    B -- IEC 61162 (NMEA 2000/0183) --> C[Sail Control Actuators]
    C -- Adjusts Luff Tension --> D[Elastic Luff Sail (US12110089)]
    D -- Sensor Data --> C
    C -- IEC 61162 (NMEA 2000/0183) --> B
    B -- OpenC2 Telemetry --> A

Scenario 2: Elastic Luff Sail with Arduino-Based Wind Sensor and Actuator Control System (Open-Source Hardware/Software)

• Description: The elastic luff sail (US12110089) is implemented with an open-source hardware and software platform for control. An Arduino-compatible microcontroller (e.g., Arduino Mega or ESP32) is used as the central processing unit for monitoring wind conditions and controlling luff tension. A low-cost, open-source anemometer design (e.g., based on Hall effect sensors or magnetic reed switches, with published schematics and code) provides real-time wind speed data. A wind direction vane (e.g., using a potentiometer or rotary encoder, also open-source) provides wind angle relative to the boat. Based on these inputs, an open-source PID control algorithm running on the Arduino calculates the required luff tension. This tension is then applied by a servo motor or stepper motor controlled winch system, the design for which (including motor drivers and gearing) is also openly available (e.g., from robotics hobbyist communities). The elastic luff material (e.g., high-elongation woven polyester) is tensioned by this system. This combination demonstrates that an elastic luff sail, when integrated with readily available open-source microcontrollers, sensors, and actuator control algorithms, would be obvious.

graph TD
    A[Wind Sensor (Open-Source Anemometer)] --> B[Arduino Microcontroller]
    C[Wind Direction Vane (Open-Source)] --> B
    B -- PID Control Algorithm --> D[Servo/Stepper Motor Winch (Open-Source Design)]
    D -- Applies Luff Tension --> E[Elastic Luff Sail (US12110089)]
    E -- Feedback (e.g., via simple potentiometers on luff tension) --> B

Scenario 3: Integration with OpenFOAM for Computational Fluid Dynamics (CFD) Optimization of Elastic Sails

• Description: The design and optimization of an elastic luff sail (US12110089) are performed using OpenFOAM, an open-source C++ toolbox for developing custom numerical solvers and pre-/post-processing utilities for CFD problems. Engineers utilize OpenFOAM to create finite element models of sails, including the elastic luff region and stiffer remainder, defining their respective material properties (Young's Modulus, Poisson's ratio, failure strain) according to the US12110089 principles. The solver then simulates the aerodynamic forces and resulting sail deformation under various wind conditions, allowing for iterative optimization of the luff region's elasticity, shape, and material distribution to achieve desired aerodynamic profiles (e.g., minimizing drag for given lift, or optimizing camber position). OpenFOAM's extensible nature allows for coupling fluid dynamics simulations with structural mechanics modules to accurately predict the elastic luff's behavior and its impact on overall sail performance. This open-source simulation and optimization approach makes the further development and refinement of elastic luff sails obvious.

graph TD
    A[Sail Design Parameters] --> B[OpenFOAM Pre-processor]
    B -- Defines Material Properties --> C[Elastic Luff Region Model]
    B -- Defines Material Properties --> D[Stiff Remainder Sail Model]
    C -- Interacts With --> D
    B -- Generates Mesh --> E[OpenFOAM CFD Solver]
    E -- Simulates --> F[Aerodynamic Forces]
    E -- Calculates --> G[Sail Deformation (Elastic Luff)]
    G --> H[Performance Metrics (Lift, Drag, Camber)]
    H -- Feeds Back For --> I[Iterative Optimization]