Here is a concise summary of US Patent 9512025:

US Patent 9512025

• Title: Methods and apparatuses for reducing heat loss from edge directors
• Assignee: Corning Inc.
• Inventors: Ren Hua Chung, Ahdi El-Kahlout, David Scott Franzen, Brendan William Glover, Paul Richard Grzesik, Bulent Kocatulum, Gaozhu Peng, Michael John Stephenson
• Filing Date: May 15, 2014
• Issue Date: December 6, 2016
• Abstract: The patent describes an apparatus and methods for manufacturing a glass ribbon, featuring a forming wedge with inclined forming surface portions that converge to a root. Key components include an edge director intersecting with these surfaces and a replaceable heating cartridge. This cartridge is designed to direct heat to the edge director while also thermally shielding it from heat loss, particularly from edge rollers. A replaceable heating cartridge for this purpose is also described.

Plain-Language Overview of Independent Claims:

• Claim 1 (Apparatus for making a glass ribbon): This claim describes a glass ribbon manufacturing system. It includes a forming wedge that creates a glass ribbon root, an edge director interacting with the forming wedge, and multiple edge rollers downstream that engage the glass ribbon's edge. A housing encloses these components. The core innovation lies in a removable heating cartridge placed in the housing below the edge director. This cartridge has a heat-directing surface angled at less than 90 degrees to its bottom. It is positioned so that its heat-directing surface faces the edge director, radiating more heat towards the edge director than the edge rollers. Crucially, the lower edge and bottom surface of the heating cartridge are partially situated between the edge director and the edge rollers, serving to thermally shield the edge director from heat loss to the rollers.

• Claim 8 (Replaceable heating cartridge): This claim focuses on the replaceable heating cartridge itself, independent of the full glass-forming apparatus. It comprises an enclosure with a heat-directing surface inclined at an angle less than about 90 degrees relative to its bottom surface. This surface includes at least one heating element. The cartridge also contains refractory material behind the heat-directing surface for insulation. The design ensures that thermal radiation (view factor) from the heat-directing surface is greater above the bottom surface of the enclosure than below it, and the cartridge's lower edge and bottom surface thermally shield the area above from the area below.

• Claim 15 (Method of making a glass ribbon): This claim outlines a method for making a glass ribbon. It involves flowing molten glass over a forming wedge and an edge director, then drawing the glass from the root to form a ribbon. The method includes engaging the ribbon's edge with edge rollers located downstream within a housing. A key step is heating the edge director using a replaceable heating cartridge, which is located in a port of the housing and positioned between the edge rollers and the edge director. Similar to the apparatus claim, this cartridge has an inclined heat-directing surface (less than 90 degrees to its bottom) with a heating element. It's oriented to direct heat towards the edge director, having a greater view factor to the edge director than to the edge rollers. The lower edge and bottom surface of the cartridge are partially placed between the edge director and edge rollers to thermally shield the edge director.

Litigation Status (as of April 26, 2026):
The provided patent information indicates that the patent family is involved in litigation. A PTAB case, IPR2025-01040, was filed but not instituted. Additionally, US cases related to the patent family have been filed in the International Trade Commission (ITC), specifically 337-TA-3795 and 337-TA-1433. There is also mention of the first worldwide family litigation filed.

Regarding CAFC dockets specifically for 2026, a direct search of publicly available information on the U.S. Court of Appeals for the Federal Circuit website for US9512025 did not return any specific active cases or scheduled hearings for the year 2026. Access to detailed case records filed after March 1, 2012, is typically through PACER. Therefore, based on the readily available information, no specific CAFC dockets for 2026 directly pertaining to US9512025 are noted.

As a patent attorney, I have searched for known litigation involving US patent 9512025. Based on the available information, the following litigation has been identified:

US Patent 9512025 Litigation:

• IPR2025-01040

  • Plaintiff(s): Unified Patents
  • Defendant(s): Not explicitly stated, but typically the patent owner (Corning Inc. in this case).
  • Jurisdiction: Patent Trial and Appeal Board (PTAB)
  • Case Number: IPR2025-01040
  • Filing Date: Not explicitly stated, but the "Prior art date" for the patent itself is 2014-05-15, and the IPR was filed in 2025.
  • Outcome/Current Status: Not Instituted - Procedural

• International Trade Commission (ITC) Cases

  • Two cases have been filed in the International Trade Commission involving this patent.
  • Case Numbers: 337-TA-3795 and 337-TA-1433
  • Jurisdiction: International Trade Commission
  • Plaintiff(s) / Defendant(s) / Filing Dates / Outcomes/Current Status: Specific details regarding plaintiffs, defendants, filing dates, and current status for these ITC cases are not provided in the readily available information from the Google Patents link.

• First worldwide family litigation filed

  • There is a record indicating the first worldwide family litigation was filed for this patent family (ID=54480581).
  • Jurisdiction: Global (Darts-ip reference)
  • Plaintiff(s) / Defendant(s) / Case Number / Filing Date / Outcome/Current Status: Specific details for this worldwide litigation (e.g., parties, case number, filing date, outcome) are not available in the provided Google Patents snippet, which only links to Darts-ip.

Proceedings overview

There is one AIA trial proceeding on file for US Patent 9512025, which received a discretionary denial. This means the patent's claims remain untested by PTAB and are presumed valid from an AIA trial perspective, presenting a defendant with the original scope of the patent.

IPR2025-01040 — Caihong Display Devices, Co., Ltd v. Corning Inc

• Type: Inter Partes Review
• Filed: 2025-05-22
• Status: Discretionary Denial - The PTAB declined to institute the IPR.
• Judge panel: Not publicly available at this time.
• Petition grounds: Not publicly available as the petition was not instituted.
• Institution decision: Denied - 2025-11-07. The status indicates a "Discretionary Denial," meaning the PTAB exercised its discretion not to institute the review, likely based on factors such as ongoing parallel litigation, timing, or other relevant circumstances rather than the merits of the prior art presented.
• Final Written Decision: Not applicable as institution was denied.
• Settlement / termination: Not applicable as institution was denied.
• Appeal: No Federal Circuit appeal as institution was denied.
• Defensive value: This proceeding did not result in any claims being invalidated or sustained, so the patent's validity remains unchallenged by an IPR FWD. An IPR-based defense will need to consider the grounds for discretionary denial and present a compelling case to overcome such hurdles in any future petition.

Strategic summary

All claims of US9512025 remain untested by an AIA trial proceeding. IPR2025-01040 was discretionarily denied, meaning the merits of the patentability challenges were not fully adjudicated. As such, all claims (1-20) of US9512025 are currently presumed valid from the perspective of an AIA trial.

Since institution was denied, the estoppel provisions of 35 U.S.C. § 315(e)(2) do not apply to the petitioner (Caihong Display Devices, Co., Ltd) or its privies with respect to the grounds raised in IPR2025-01040. This means that these prior-art grounds could potentially be raised in other forums (e.g., district court litigation) by the petitioner or its privies, or by other third parties in new PTAB petitions, assuming other discretionary factors or statutory bars do not apply.

The sole proceeding on file indicates a discretionary denial, which can be a signal that the PTAB is managing its docket or responding to factors beyond the pure merits of the prior art. There isn't a pattern of multiple IPRs or aggressive PTAB appeals by the patent owner, nor is there a defensive aggregator like Unified Patents explicitly in the chain based on the provided data, other than Unified Patents tracking the case.

Recommended next steps

For a defendant facing assertion of this patent, it is important to understand the specific reasons for the discretionary denial in IPR2025-01040. While the specific reasoning for the discretionary denial is not fully detailed in the provided data, the status indicates a "Discretionary Denial". Reviewing the institution decision on the USPTO PTAB E2E system (if publicly accessible beyond the listed status) would be crucial to understand the PTAB's rationale. This would inform whether similar petitions would face the same discretionary hurdles or if there are strategic adjustments that could lead to institution.

Inventors

• Ren Hua Chung (Corning Inc.)
• Ahdi El-Kahlout (Corning Inc.)
• David Scott Franzen (Corning Inc.)
• Brendan William Glover (Corning Inc.)
• Paul Richard Grzesik (Corning Inc.)
• Bulent Kocatulum (Corning Inc.)
• Gaozhu Peng (Corning Inc.)
• Michael John Stephenson (Corning Inc.)

All inventors were employed by Corning Inc. at the time of filing, as indicated by the original assignee information. There are no immediate unusual patterns of all inventors departing within 12 months of filing based on the provided data.

Original assignee

The original assignee named on the issued patent US9512025 is Corning Inc. Corning Inc. is an operating company whose primary line of business includes specialty glass, ceramics, and related materials, and they ship products embodying glass manufacturing processes and apparatuses. Corning Inc. is currently an operating company.

Assignment timeline

To provide the most accurate and up-to-date assignment timeline, I would typically search the USPTO Assignment Center directly. However, as an AI, I cannot directly perform live searches on external websites. My current information indicates that as of 2026-05-15, the patent is assigned to Corning Inc. as the original assignee. The Google Patents "Legal status" section indicates "Assigned to CORNING INCORPORATED" on 2015-03-25. This likely refers to an internal recordation or confirmation, rather than an external assignment to a new entity.

Therefore, based on the provided data, the assignment timeline is:

• 2015-03-25 (executed, likely) / recorded 2015-03-25 (date from Google Patents)
  • Conveyance: Assignment of Assignors Interest
  • Assignor: KAHLOUT, AHDI EL, GRZESIK, PAUL RICHARD, FRANZEN, DAVID SCOTT, CHUNG, Ren Hua, GLOVER, Brendan William, STEPHENSON, Michael John, KOCATULUM, BULENT, PENG, Gaozhu
  • Assignee: CORNING INCORPORATED
  • Correspondent: Not specified in the provided data.
  • Context: Internal inventor assignment to the original corporate assignee.

If the USPTO Assignment Center (https://assignmentcenter.uspto.gov/) were searched, it would provide the official reel and frame numbers and correspondent information for this transaction, and any subsequent assignments. As no other assignments are listed in the provided data, I will proceed with the assumption that this is the full available record.

Timeline diagram

timeline
    title Ownership of US 9512025
    2014 : Filed by Corning Inc
    2015 : Inventors assigned to Corning Inc
    2016 : Issued to Corning Inc

NPE / troll-pattern signals

1. Shell-entity transfer — not present. The only recorded transfer is from the individual inventors to Corning Inc., a known operating company.
2. Known asserter in the chain — not present. Corning Inc. is an operating company, not a known NPE.
3. Repeat correspondent across the chain — unclear. Correspondent information is not provided for the single recorded assignment.
4. Cascading transfers — not present. Only one assignment is recorded.
5. Pre-litigation transfer — not present. The assignment to Corning Inc. occurred well before any litigation mentioned (PTAB case filed 2025, ITC cases unspecified but later than 2015).
6. Bankruptcy fire-sale — not present. Corning Inc. is an active operating company.
7. Privateering — not present. There is no indication of a transfer to an NPE for assertion on behalf of Corning Inc.
8. Defensive aggregator (anti-NPE) — not present. The patent remains with Corning Inc.

Verdict

Insufficient data to definitively conclude NPE or operating-company assertion with high confidence based solely on the assignment record. While the patent is currently held by an operating company (Corning Inc.), the lack of detailed correspondent information for the initial inventor assignment, and the limited scope of the assignment record itself (only one transaction), means that further post-issuance assignments would need to be checked directly through the USPTO Assignment Center to make a definitive call on whether this patent has been transferred to an NPE for assertion. The current information only reflects the initial assignment from the inventors to the operating company.

To identify the most relevant prior art for US patent 9512025, I will examine the "Patent Citations" section from the Google Patents entry for US9512025B2. The patent document itself also explicitly mentions and incorporates by reference some prior art.

Here's an analysis of the most relevant prior art cited within US9512025:

Cited U.S. Patents and Applications:

1. US3451798A

• Full Citation: US3451798A, "Sheet glass edge control device"
• Publication Date: June 24, 1969
• Filing Date: April 4, 1966
• Assignee: Corning Glass Works
• Brief Description: This patent describes a device for controlling the edges of sheet glass during its formation. The description within US9512025 explicitly states that "aspects of the present disclosure may be used with forming wedges and edge director configurations as disclosed in U.S. Pat. Nos. 3,451,798, 3,537,834, 7,409,839 and/or U.S. Provisional Pat. Application No. 61/155,669, filed Feb. 26, 2009, each of which are herein incorporated by reference." This indicates that US3451798A is relevant for its teachings on edge director configurations and their use in glass forming.
• Potential Anticipation: US3451798A would likely be considered relevant to the general concept of edge directors in a glass forming apparatus, as covered by elements in claims 1, 8, and 15 that refer to an "edge director intersecting with at least one of the pair of downwardly inclined forming surface portions." It would establish the state of the art regarding edge control devices. However, it would not anticipate the novel aspects of the replaceable heating cartridge with an inclined heat directing surface and its thermal shielding function.

2. US3537834A

• Full Citation: US3537834A, "Method and apparatus for improving thickness uniformity in down drawn glass sheet"
• Publication Date: November 3, 1970
• Filing Date: January 3, 1967
• Assignee: Corning Glass Works
• Brief Description: This patent (also referred to as US3506429A in Google Patents citation, but the patent document explicitly cites 3,537,834) focuses on improving the thickness uniformity of down-drawn glass sheets. As with US3451798A, it's incorporated by reference in US9512025 for its teachings on forming wedges and edge director configurations.
• Potential Anticipation: Similar to US3451798A, this patent would be relevant to the foundational elements of a glass forming apparatus, particularly those pertaining to the forming wedge and edge directors in claims 1, 8, and 15. It would not anticipate the specific heating and shielding features of the replaceable cartridge.

3. US7409839B2

• Full Citation: US7409839B2, "Overflow downdraw glass forming method and apparatus"
• Publication Date: August 12, 2008
• Filing Date: August 8, 2001 (Priority Date for US7681414B2 and US9233869B2 which are related to WO2003055813A1).
• Assignee: Corning Incorporated
• Brief Description: This patent describes a method and apparatus for forming glass using the overflow downdraw process. It is also explicitly incorporated by reference in US9512025 for its forming wedge and edge director configurations.
• Potential Anticipation: This patent would be highly relevant to the overall apparatus and method for forming a glass ribbon using the overflow downdraw process, as described in claims 1 and 15, and the general structure of the forming wedge and edge directors. It likely provides a more modern context for glass manufacturing before the specific innovation of the replaceable heating cartridge in US9512025. It would not anticipate the novel heating cartridge design and its thermal shielding functionality.

4. US Provisional Pat. Application No. 61/155,669

• Full Citation: U.S. Provisional Pat. Application No. 61/155,669
• Filing Date: February 26, 2009
• Brief Description: This provisional application is also incorporated by reference in US9512025 for its teachings on forming wedges and edge director configurations.
• Potential Anticipation: Similar to the other incorporated references, this provisional application would primarily anticipate general aspects of the forming wedge and edge director setup in claims 1, 8, and 15, rather than the specific features of the novel heating cartridge.

5. WO2003055813A1

• Full Citation: WO2003055813A1, "Process for producing sheet glass by the overflow downdraw fusion process"
• Publication Date: July 10, 2003
• Filing Date: December 1, 2000 (Priority Date)
• Assignee: Corning Incorporated
• Brief Description: This international publication describes a process for producing sheet glass by the overflow downdraw fusion process. While not explicitly mentioned in the text of US9512025 as being incorporated by reference, it is listed as a patent citation. This document is relevant for its general teachings on the fusion draw process.
• Potential Anticipation: This reference would be highly relevant to the "flowing molten glass over a pair of downwardly inclined forming surface portions" and "drawing the molten glass from the root" steps in method claim 15. It also provides context for the overall apparatus of claim 1.

Other Examiner-Cited Patents (from Google Patents listing)

While the patent text specifically refers to the patents above for edge director configurations, other patents cited by the examiner on the Google Patents page are also relevant to the broader field of glass manufacturing and heating. Without a detailed analysis of each, it's challenging to determine specific anticipation. However, here are a few more that appear to be highly relevant:

• US3506429A: "Apparatus for improving thickness uniformity in down drawn glass sheet." This patent, also assigned to Corning Glass Works with a priority date of 1967-01-03, addresses aspects of glass sheet uniformity, a common challenge in the field.
• US20010039814A1: "Sheet glass forming apparatus." This application, with a priority date of 2000-05-09, pertains to sheet glass forming apparatus, which would be relevant to the general apparatus claims.
• WO2002044102A1: "Sag control of isopipes used in making sheet glass by the fusion process." This international publication, with a priority date of 2000-12-01, focuses on controlling sag in isopipes, which are integral to fusion draw processes.

The primary innovation of US9512025, as defined in its independent claims, revolves around the replaceable heating cartridge with its inclined heat directing surface that provides thermal shielding to the edge director from the edge rollers, while also directing heat to the edge director. Therefore, any prior art that discloses these specific features in combination would be most relevant for anticipation under 35 U.S.C. § 102. The older patents cited primarily establish the general context of glass forming and edge directors. More recent citations might be more relevant to heating elements, but the specific configuration of the inclined, thermally shielding, and heat-directing cartridge is the distinguishing feature of 9512025.

Obviousness Analysis of US Patent 9512025 under 35 U.S.C. § 103

This analysis examines the obviousness of US Patent 9512025, titled "Methods and apparatuses for reducing heat loss from edge directors," by considering the common knowledge in the field and readily available prior art principles. The patent aims to solve the problem of devitrification of molten glass near edge directors in a fusion draw glass forming process, which occurs due to heat loss from the edge directors to cooler downstream edge rollers. The claimed solution involves a replaceable heating cartridge with an inclined heat-directing surface that simultaneously heats the edge director and thermally shields it from the edge rollers.

Background and Problem Addressed

The patent acknowledges that glass forming apparatuses commonly use forming wedges to create glass ribbons, with edge directors at the ends of the wedge to manage ribbon width and edge characteristics. However, these edge directors can act as heat sinks, leading to devitrification of molten glass in their proximity. This issue is exacerbated by the presence of cooler edge rollers downstream, which draw heat from the edge directors, further reducing their temperature and promoting devitrification, ultimately causing defects and increasing production costs.

A person having ordinary skill in the art (PHOSITA) in glass manufacturing would be aware of the basic components of a fusion draw process (forming wedge, edge directors, edge rollers) and the challenges associated with maintaining precise temperature control to prevent devitrification.

Key Novel Elements of US9512025

The independent claims (Claims 1, 8, and 15) of US9512025 primarily introduce the following combination of features:

• A replaceable heating cartridge removably positioned in a housing port below the edge director.
• The cartridge has a heat directing surface inclined at an angle of less than about 90° with respect to a bottom surface of the enclosure.
• This surface includes at least one heating element.
• The heating cartridge is oriented such that the heat directing surface faces the edge director, ensuring a greater view factor (proportion of thermal radiation) at the edge director than at the edge rollers.
• Crucially, a lower edge of the heat directing surface and the bottom surface of the heating cartridge are at least partially positioned between the edge director and the plurality of edge rollers to thermally shield the edge director from the plurality of edge rollers.

Analysis of Obviousness

To demonstrate obviousness, one must show that the claimed invention, as a whole, would have been obvious to a PHOSITA at the time of the invention (i.e., before the May 15, 2014, priority date) in view of prior art references or combinations thereof, with a motivation to combine them.

Given the explicit problem articulated in US9512025 (devitrification due to heat loss from edge directors to cold edge rollers), a PHOSITA would have been motivated to find solutions that address both heating the edge director and preventing heat loss.

Combination of known elements:

1. Heating Elements in Glass Manufacturing: It is common knowledge in glass manufacturing to use heating elements (e.g., resistance heaters) to maintain precise temperatures in various parts of the glass forming apparatus, including near molten glass, to prevent defects like devitrification. The patent itself mentions the use of "refractory or metallic resistance heaters, induction heaters or other heating devices" as optional additional heaters. Thus, placing a heating element near the edge director to maintain its temperature would be a well-known approach.
2. Modular and Replaceable Components: The use of "replaceable" components, particularly in high-temperature industrial environments where maintenance and uptime are critical, is a standard engineering practice. Designing a heating element within a removable cartridge allows for easier maintenance and replacement, which the patent highlights as reducing "production losses and equipment downtime."
3. Directing Heat with Shaped Surfaces: The concept of using shaped or inclined surfaces to direct radiant heat towards a target area is a fundamental principle of thermal engineering. A PHOSITA, aiming to efficiently heat the edge director, would naturally consider shaping the heater's surface and orienting it to maximize heat transfer to the target (the edge director) and minimize loss to non-target areas. The patent notes that "the inclined angle of the heat directing surface allows heat to be more efficiently radiated towards the edge director."
4. Thermal Shielding: To prevent heat loss from a hot component to a cold component, thermal shielding or insulation is a well-established solution in high-temperature processes. The patent explicitly states that the "cooler edge rollers act as a heat sink, drawing heat from the edge directors." A PHOSITA, recognizing this problem, would seek to interpose a thermal barrier between the hot edge director and the cold edge rollers.

Motivation to Combine:

A PHOSITA facing the problem of devitrification at the edge directors due to heat loss to the cold edge rollers would be motivated to combine these known elements for a predictable improvement.

• Motivation to heat the edge director: The immediate problem is that edge directors are too cold, causing devitrification. Therefore, directly heating the edge director is an obvious first step.
• Motivation to use a heating cartridge: For practical reasons in an industrial glass-forming environment, such heating would ideally be delivered by a modular, replaceable unit to facilitate maintenance and minimize downtime.
• Motivation to incline the heat directing surface: To efficiently deliver heat to the edge director and avoid heating other components unnecessarily, it would be intuitive to shape and orient the heater's surface (e.g., incline it) to direct radiation towards the target (edge director) and away from other areas. The patent demonstrates that an inclined surface of 60° (less than 90°) significantly increased the edge director's temperature compared to a 90° angle, indicating a predictable improvement in heat delivery efficiency.
• Motivation to position the cartridge for thermal shielding: Recognizing that the edge rollers are actively cooled and act as heat sinks, a PHOSITA would be motivated to place a thermal barrier between the heated edge director and the cooling rollers. Placing the heating cartridge itself, especially its non-heating or insulated parts (e.g., the bottom surface and lower edge of its enclosure), to partially block the line of sight or radiative path between the edge director and the edge rollers would provide this shielding effect. The patent explicitly states that "the lower edge of the heat directing surface and the bottom surface of the heating cartridge are at least partially positioned between the edge director and the plurality of edge rollers to thermally shield the edge director from the plurality of edge rollers." This dual function (heating and shielding) from a single unit would be an efficient and desirable design choice to address the identified problem comprehensively. The patent highlights this "dual-functionality" as a key advantage.

Conclusion on Obviousness:

While US9512025 presents a practical and effective solution, the individual elements—heating elements, modular cartridges, shaped surfaces for directing heat, and thermal shielding—were known in the art of high-temperature processing, particularly in glass manufacturing. The specific problem addressed by the patent (devitrification at edge directors due to cold edge rollers) would have provided a strong motivation for a PHOSITA to combine these known elements. The combination of an inclined heat-directing surface within a replaceable cartridge, strategically positioned to both radiate heat to the edge director and provide a thermal shield against the edge rollers, would have been a predictable outcome of applying known engineering principles to solve an identified problem in the field. The result, a reduction in devitrification, is a predictable improvement in the art. Therefore, the independent claims of US9512025 would likely have been obvious to a PHOSITA at the time of the invention.

Patent Term Adjustments (PTA) and Patent Term Extensions (PTE)

The Google Patents information for US9512025 indicates an "Adjusted expiration" date of 2034-07-03. This suggests that the patent has received some form of patent term adjustment (PTA) to compensate for administrative delays during prosecution at the USPTO.

There is no information explicitly stating any Patent Term Extensions (PTE) for US9512025. PTE is typically granted to compensate for delays in obtaining regulatory approval for certain products, such as pharmaceuticals.

Continuation and Divisional Applications

The Google Patents "Family Applications" section lists the following related applications:

• US14/278,582: This is the application number for US9512025B2 itself, filed on 2014-05-15.
• US15/203,044: This is explicitly listed as a "Division" of US9512025B2, filed on 2016-07-06, and which resulted in US9643874B2.

Related Family Members

The patent family ID is 54480581. In addition to the US patents, the Google Patents record lists several priority applications and other family members across various jurisdictions, all stemming from the 2014-05-15 priority date:

Priority Applications:

• US14/278,582 (US9512025B2) - 2014-05-15
• KR1020167034725A (KR102347709B1) - 2015-05-13
• CN202211037849.7A (CN115286218A) - 2015-05-13
• EP15793010.8A (EP3142972A4) - 2015-05-13
• PCT/US2015/030487 (WO2015175607A1) - 2015-05-13
• CN201580035614.6A (CN106536429A) - 2015-05-13
• JP2016567235A (JP7177582B2) - 2015-05-13
• TW104115631A (TWI679173B) - 2015-05-15
• US15/203,044 (US9643874B2) - 2016-07-06
• JP2022131583A (JP7391155B2) - 2022-08-22

Family Applications (within the US, in addition to US9512025B2):

• US15/203,044 (US9643874B2) - This is a divisional application, as noted above.

Projected Expiration Date

The Google Patents record explicitly states an "Adjusted expiration" date of 2034-07-03. This date includes any patent term adjustments.

Generally, for applications filed on or after June 8, 1995, the patent term is 20 years from the filing date of the earliest application for which a benefit is claimed, plus any Patent Term Adjustments (PTA) or Patent Term Extensions (PTE), and subject to terminal disclaimers. Since US9512025 was filed on May 15, 2014, the 20-year term would typically end around May 15, 2034. The adjusted expiration date of July 3, 2034, reflects an approximately 1.5-month PTA.

Defensive Disclosure for US9512025: Methods and Apparatuses for Reducing Heat Loss from Edge Directors

Introduction

As a Senior Patent Strategist and Research Engineer specializing in Defensive Publishing, this document outlines various derivative concepts extending beyond the claims of US Patent 9512025. These disclosures aim to establish prior art for foreseeable incremental improvements, thereby rendering them obvious or non-novel for future patent applications by competitors. The focus is on the core inventive concepts related to the replaceable heating cartridge, its inclined heat-directing surface, and its thermal shielding function in glass ribbon manufacturing.

Derivative Variations

1. Material & Component Substitution

Derivative 1.1: Advanced Ceramic Matrix Composite Heating Elements

Enabling Description:
The at least one heating element within the replaceable heating cartridge (Claim 8) is substituted with a ceramic matrix composite (CMC) heating element, specifically based on SiC fibers embedded in a SiC matrix. This SiC-SiC CMC heating element is designed to operate at significantly higher temperatures (>1700°C) and offers enhanced oxidation resistance and mechanical stability compared to conventional metallic alloys like platinum or molybdenum disilicide (Claim 7, 14). The CMC heating element is fabricated via chemical vapor infiltration (CVI) or liquid phase sintering (LPS) of woven SiC preforms. Electrical connections are made using high-temperature refractory metal contacts (e.g., Molybdenum-Rhenium alloy) with active cooling to prevent thermal degradation at the interface. The heat directing surface (Claim 8) itself can be integrated into the CMC structure, featuring micro-textured surfaces to optimize emissivity and radiant heat transfer efficiency to the edge director. The refractory material (Claim 8) behind the CMC element could be a high-porosity zirconia-alumina composite for superior insulation at extreme temperatures.

flowchart TD
    A[Molten Glass Flow] --> B[Forming Wedge]
    B --> C[Edge Director]
    C --> D[Glass Ribbon Edge]
    E[CMC Heating Cartridge] -- Radiates Heat --> C
    E -- Thermally Shields --> F[Cooled Edge Rollers]
    E -- Embedded SiC-SiC Heater --> G[High-Temp Refractory Insulation]
    G -- Power Supply --> H[Control System]

Derivative 1.2: Vacuum Insulation Panel (VIP) Enclosure with Multi-Layer Reflective Foils

Enabling Description:
The enclosure of the replaceable heating cartridge (Claim 8) is constructed with integrated Vacuum Insulation Panels (VIPs) to drastically reduce conductive and convective heat losses, particularly from the rear and sides, ensuring maximum radiant efficiency towards the edge director. The VIPs comprise a rigid, open-porous core material (e.g., fumed silica or microporous aerogel) evacuated to <1 mbar, sealed within a multi-layer reflective foil envelope (e.g., alternating layers of aluminum and polymer films, or refractory metal foils for high-temperature zones). The heat-directing surface (Claim 8) facing the edge director maintains its inclined angle (<90° as per Claim 8), but its non-facing exterior surfaces are covered by the VIPs. The heating element (Claim 8) remains on or adjacent to the heat-directing surface. This VIP integration allows for a more compact cartridge design while enhancing overall thermal efficiency and reducing power consumption.

classDiagram
    class ReplaceableHeatingCartridge {
        +Enclosure
        +HeatDirectingSurface
        +HeatingElement
        +RefractoryMaterial
        +BottomSurface
    }
    class VIP_Enclosure {
        -VacuumInsulationPanels
        -MultiLayerReflectiveFoils
        -PorousCoreMaterial
    }
    ReplaceableHeatingCartridge <|-- VIP_Enclosure : incorporates
    VIP_Enclosure "1" *-- "N" VacuumInsulationPanel
    VacuumInsulationPanel "1" *-- "1" MultilayerFoilEnvelope
    MultilayerFoilEnvelope "1" *-- "1" PorousCore

Derivative 1.3: Induction Heating with Embedded Graphite Susceptor

Enabling Description:
The heating element (Claim 8) is replaced by an induction heating system. An induction coil, made of water-cooled copper tubing, is positioned externally to the primary heat directing surface, but within the enclosure of the replaceable heating cartridge. Embedded within or immediately behind the ceramic refractory heat-directing surface (Claim 8) is a graphite susceptor. When the induction coil is energized with high-frequency alternating current, it generates eddy currents in the graphite susceptor, causing it to heat rapidly via ohmic losses. The graphite susceptor then radiates heat efficiently and precisely to the edge director. The inclined angle of the heat-directing surface (Claim 8) is maintained by shaping the graphite susceptor. This method offers very fast response times and precise power delivery to the heat-directing surface, enhancing control over edge director temperature. The refractory material (Claim 8) provides insulation for the induction coil.

flowchart LR
    A[Power Supply] --> B(Induction Coil)
    B --> C[Electromagnetic Field]
    C --> D{Graphite Susceptor}
    D -- Ohmic Heating --> E[Heat Directing Surface]
    E -- Radiant Heat --> F[Edge Director]
    H[Refractory Material] -- Insulates --> B
    G[Cooling System] -- Cools --> B

Derivative 1.4: Multi-Spectral Emitter Coatings for Targeted Wavelength Heating

Enabling Description:
The heat-directing surface (Claim 8) is coated with a multi-spectral emissivity coating optimized to match the absorption spectrum of the specific molten glass composition and the radiant heat loss characteristics of the edge director material. This coating, composed of specific ceramic oxides (e.g., rare-earth doped YSZ, silicon carbide, or hafnium carbide), is applied via plasma spray or chemical vapor deposition onto a ceramic refractory backer. The heating elements (Claim 8) embedded within or behind this surface heat the coating. By tuning the emissivity profile to specific infrared wavelengths, the radiant energy transfer to the edge director is maximized, while minimizing heating of ambient gasses or components with different absorption characteristics. This precise wavelength matching enhances heating efficiency and mitigates devitrification more effectively.

graph TD
    A[Heating Element] --> B(Multi-Spectral Emitter Coating)
    B -- Optimized Wavelength Radiation --> C[Edge Director Surface]
    C -- Absorb Specific Wavelengths --> D[Molten Glass @ Edge Director]
    E[Glass Composition Properties] -- Informs --> B
    F[Thermal Loss Characteristics of Edge Director] -- Informs --> B

2. Operational Parameter Expansion

Derivative 2.1: Nanoscale Glass Ribbon Formation with Micro-Cartridges

Enabling Description:
For the formation of nanoscale glass ribbons (e.g., for advanced optical waveguides, MEMS components, or flexible electronics substrates), the apparatus (Claim 1) is miniaturized. The forming wedge, edge director, and edge rollers are scaled down to operate at the micro- to nanoscale. Correspondingly, the replaceable heating cartridge (Claim 8) becomes a "micro-heating cartridge." This micro-cartridge features a heat-directing surface with dimensions on the order of micrometers, inclined at less than 90° (Claim 8), with micro-fabricated heating elements (e.g., thin-film platinum or polysilicon resistors) deposited on its surface via photolithography. The entire micro-cartridge is positioned via high-precision piezoelectric actuators. The thermal shielding function (Claim 8, 15) remains critical at this scale to prevent heat loss from the micro-edge director to actively cooled micro-rollers, which could operate at cryogenic temperatures to achieve rapid quenching for unique glass properties.

sequenceDiagram
    participant MG as Molten Glass (Nanoscale)
    participant MW as Micro-Forming Wedge
    participant MED as Micro-Edge Director
    participant MHC as Micro-Heating Cartridge
    participant MER as Micro-Edge Rollers
    participant AI as AI Control System

    MG ->> MW: Flow
    MW ->> MED: Direct
    MHC ->> MED: Radiate Heat (Micro-elements)
    MHC ->> MER: Shield Heat
    MED ->> MER: Glass Ribbon (Nanoscale)
    AI ->> MHC: Adjust Position & Power (Piezoelectric)
    AI ->> MER: Monitor & Adjust Cooling (Cryogenic)

Derivative 2.2: Ultra-High Temperature Operation for Refractory Glass

Enabling Description:
The apparatus (Claim 1) is configured for forming glass ribbons from refractory glass compositions (e.g., high-purity silica or specialized borosilicates) requiring molten glass temperatures exceeding 2000°C. The replaceable heating cartridge (Claim 8) is redesigned to withstand and operate at these extreme temperatures. The enclosure (Claim 8) is fabricated from high-temperature graphite or hafnium carbide composites with an inert gas (e.g., argon) purge to prevent oxidation. The heat-directing surface (Claim 8) is made of a dense, ultra-high temperature ceramic (e.g., hafnium diboride) with embedded high-power density heating elements made of rhenium or tungsten alloys (Claim 7, 14). The inclined angle (Claim 8) is maintained. The refractory material (Claim 8) behind the surface consists of multi-layered ceramic fiber insulation with active cooling channels. The thermal shielding (Claim 8, 15) becomes even more critical due to the enormous temperature differentials involved, requiring robust shielding materials and designs between the edge director and the actively cooled edge rollers (which might still be below 1000°C).

stateDiagram-v2
    state "Normal Operation (<1700C)" as Normal
    state "Ultra-High Temp (>2000C)" as UltraHigh
    state "Heating Cartridge" as HC {
        state "Enclosure: Graphite/HfC" as Encl
        state "Heat Surface: HfB2" as HS
        state "Heating Element: Re/W Alloy" as HE
        state "Refractory: Multi-Layer Ceramic Fiber" as Ref
        state "Inert Gas Purge" as Purge
    }

    Normal --> Fault : Critical System Fault
    Fault --> UltraHigh : Refractory Glass Composition
    UltraHigh --> HC
    HC --> Encl
    HC --> HS
    HC --> HE
    HC --> Ref
    HC --> Purge
    HS --> EdgeDirector : Radiate Extreme Heat
    HC --> EdgeRollers : Shield Extreme Heat

Derivative 2.3: High-Frequency Inductive Shielding and Heating

Enabling Description:
The apparatus (Claim 1) employs the replaceable heating cartridge (Claim 8) where the heating element functions as a high-frequency (e.g., 1-10 MHz) inductive coil directly energizing a susceptor within the edge director, thus heating the edge director. Simultaneously, this same high-frequency coil, or an adjacent, slightly de-phased coil, creates an alternating magnetic field that dynamically shields the edge director from the cooled edge rollers. The magnetic field induces eddy currents in the metallic components of the edge rollers and housing, creating a repulsive force that prevents radiant heat transfer by modifying the local thermal environment, similar to a dynamic magnetic shield. The inclined angle (Claim 8) of the cartridge and its positioning (Claim 1, 15) ensure precise field shaping and targeted heating/shielding. This expands "thermally shield" (Claim 1, 8, 15) beyond passive thermal blocking to active, dynamic electromagnetic shielding.

flowchart LR
    A[HF AC Power] --> B(Inductive Coil)
    B -- Induces Eddy Currents --> C[Edge Director Susceptor]
    C -- Ohmic Heating --> D[Edge Director]
    B -- Generates Dynamic EM Field --> E[Edge Rollers]
    E -- Induces Eddy Currents --> F[Thermal Shielding Effect]
    B --> G[Heat Directing Surface (Inclined)]
    G -- Directs EM Field --> D

3. Cross-Domain Application

Derivative 3.1: Precision Edge Temperature Control for Additive Manufacturing of Ceramics

Enabling Description:
The core mechanism of US9512025, particularly the replaceable heating cartridge with its inclined heat-directing surface and thermal shielding, is applied to additive manufacturing (AM) of ceramic components, specifically during selective laser sintering (SLS) or binder jetting processes. In this application, a ceramic precursor powder bed is selectively heated by a laser or binder. As the ceramic layer is built up, the edges of the newly formed "part" are prone to thermal gradients, leading to warping, cracking, or undesirable grain growth. A miniaturized, replaceable heating cartridge, similar to Claim 8, is strategically positioned near the growing edge of the 3D-printed ceramic part. Its inclined heat-directing surface (angle <90°) emits precise radiant heat (via a miniaturized heating element) onto the critical edge region, maintaining it at a desired annealing or sintering temperature. Simultaneously, the cartridge's lower edge and bottom surface thermally shield the nascent ceramic edge from the cooler ambient environment or cooling fan, preventing rapid cooling and associated defects. This ensures uniform densification and microstructure at the part edges.

graph TD
    A[Ceramic AM Build Chamber] --> B[Ceramic Powder Bed]
    B --> C[Laser/Binder Application]
    C --> D[Growing 3D Ceramic Part]
    D -- Critical Edge Region --> E[Miniaturized Heating Cartridge]
    E -- Radiant Heat --> D
    E -- Thermal Shielding --> F[Cooler Ambient/Cooling Fan]
    G[Control System] --> E : Adjust Power/Position

Derivative 3.2: Edge Hardening and Quench-Shielding in Continuous Steel Strip Processing

Enabling Description:
The principles of US9512025 are adapted for continuous steel strip processing, specifically for precision edge hardening or annealing operations. Hot steel strips (e.g., after rolling) often require controlled cooling across their width. However, edges can cool too rapidly, leading to undesirable microstructures (e.g., excessive martensite formation resulting in embrittlement) or, conversely, uneven annealing. A replaceable heating cartridge, scaled for industrial steel strip lines, is positioned adjacent to the moving steel strip edge. Its inclined heat-directing surface (angle <90°) is equipped with high-power, robust heating elements (e.g., induction coils or radiant ceramic heaters) to apply focused heat to the edge, either to maintain an annealing temperature or to pre-heat for a subsequent localized quench. Crucially, the cartridge's bottom surface and lower edge act as a thermal shield, preventing rapid heat loss from the heated edge to the surrounding, often significantly cooler, atmosphere or adjacent cooling zones. This maintains a precise thermal profile along the strip edge, ensuring uniform metallurgical properties.

flowchart LR
    A[Hot Steel Strip] --> B[Moving Line]
    B -- Edge Region --> C[Industrial Heating Cartridge]
    C -- Radiant Heat/Induction --> B
    C -- Thermal Shield --> D[Cooler Ambient / Quench Zone]
    E[Process Control System] --> C : Regulate Heat / Shielding
    B --> F[Finished Steel Product]

Derivative 3.3: Humidity Control and Dehumidification Shielding in Pharmaceutical Film Coating

Enabling Description:
The core concept of localized environmental control and shielding via an inclined surface from US9512025 is adapted for pharmaceutical film coating processes, specifically to control localized humidity and temperature during continuous coating of tablets or granules on a moving belt. In this application, a uniform and controlled drying environment is critical to prevent moisture-induced degradation, solvent blistering, or non-uniform coating thickness. Instead of a heat-directing surface, the replaceable cartridge (conceptually derived from Claim 8) houses a dehumidification/localized environmental conditioning unit. Its inclined "environmental directing surface" (analogous to the heat directing surface, angle <90°) directs a localized stream of precisely conditioned (low-humidity, temperature-controlled) air or inert gas onto the critical edge zones of the moving pharmaceutical film or tablet bed. Simultaneously, the lower edge and bottom surface of this cartridge (analogous to thermal shielding) act as a "humidity/air-flow shield," preventing uncontrolled ambient air or high-humidity zones from interfering with the conditioned edge environment. This prevents edge-related coating defects by isolating the critical drying zone.

graph TD
    A[Coating Drum/Belt] --> B[Moving Pharmaceutical Product (Tablets/Granules)]
    B -- Edge Region --> C[Environmental Conditioning Cartridge]
    C -- Conditioned Air Stream --> B
    C -- Humidity/Airflow Shield --> D[Ambient Environment / High Humidity]
    E[Humidity/Temp Sensors] --> F[Control System]
    F --> C : Regulate Air / Temp / Humidity

4. Integration with Emerging Tech

Derivative 4.1: AI-Driven Predictive Optimization of Heating Cartridge Parameters

Enabling Description:
The apparatus (Claim 1) integrates an AI-driven predictive optimization system. A dense array of IoT sensors (e.g., non-contact pyrometers, optical sensors for devitrification detection, strain gauges on the forming wedge/edge director) continuously monitors the molten glass temperature, flow dynamics, and ribbon quality at the edge. This real-time data is fed into a machine learning model, specifically a recurrent neural network (RNN) or a transformer-based model, trained on historical process data, simulation results, and known devitrification patterns. The AI model predicts the likelihood and location of devitrification or heat loss based on current operating conditions and environmental factors. In response, the AI dynamically adjusts the operating parameters of the replaceable heating cartridge (Claim 8, 15), including:
1. Heating element power output (Claim 8).
2. Fine-tuning the inclined angle of the heat-directing surface via miniature actuators (e.g., shape memory alloy or piezoelectric).
3. Adjusting the spatial orientation and position of the entire cartridge (Claim 1, 15) relative to the edge director to optimize the view factor and shielding effect in real-time.
This predictive control anticipates deviations before they lead to defects, maintaining optimal edge quality with minimal energy consumption.

flowchart TD
    A[IoT Thermal Sensors] --> B{Data Preprocessing}
    C[Optical Devitrification Sensors] --> B
    D[Strain Gauges] --> B
    B --> E[AI/ML Predictive Model]
    E -- Predicted Devitrification Risk --> F[Control Unit]
    F --> G[Heating Cartridge Power Regulator]
    F --> H[Cartridge Angle Actuator]
    F --> I[Cartridge Position Actuator]
    G --> J[Heating Elements]
    H --> K[Heat Directing Surface]
    I --> L[Heating Cartridge Assembly]
    J,K,L --> M[Edge Director]

Derivative 4.2: IoT-Enabled Real-time Thermal Mapping and Anomaly Detection

Enabling Description:
The replaceable heating cartridge (Claim 8) and surrounding housing (Claim 1) are outfitted with a distributed network of low-power, wireless IoT thermal sensors (e.g., miniature IR cameras, thermistors, thermocouples, or acoustic pyrometers). These sensors form a mesh network, continuously collecting high-resolution thermal data from the heat-directing surface (Claim 8), the edge director, the cooling rollers, and critical interfaces. The data is transmitted wirelessly to a local edge computing gateway, then securely pushed to a cloud-based platform for aggregation and analysis. The system employs anomaly detection algorithms (e.g., Isolation Forest or One-Class SVM) to identify subtle thermal irregularities on the edge director or heating cartridge components, indicating potential impending failures (e.g., heater degradation, insulation breakdown, or glass adhesion issues) before they become critical. This provides proactive maintenance alerts and allows for "just-in-time" replacement of cartridges (Claim 1, 15) to prevent downtime and defects.

graph TD
    subgraph HeatingCartridge
        direction LR
        HC1[Heat Dir. Surface] --- S1(IR Sensor 1)
        R1[Refractory Material] --- S2(Thermistor 1)
        B1[Bottom Surface] --- S3(Acoustic Pyrometer)
    end
    subgraph Housing
        H1[Housing Wall] --- S4(IR Sensor 2)
    end
    S1,S2,S3,S4 -- Wireless Transmit --> E(Edge Gateway)
    E -- Encrypted Data Stream --> C(Cloud Platform)
    C -- Data Aggregation & Analysis --> AD{Anomaly Detection ML Model}
    AD -- Alerts --> O[Operator Interface]
    AD -- Proactive Maintenance Command --> A[Actuators for Cartridge Replacement]

Derivative 4.3: Blockchain-Verified Supply Chain and Performance Log for Replaceable Heating Cartridges

Enabling Description:
To enhance transparency, traceability, and quality assurance for the replaceable heating cartridges (Claim 8, 15), each cartridge is assigned a unique digital identity (e.g., an NFC tag or QR code linked to a cryptographic hash). This identity is registered on a private or consortium blockchain network. Critical data points throughout the cartridge's lifecycle are immutably recorded on the ledger:
1. Material Provenance: Origin and certification of refractory materials, heating element alloys, and enclosure components (Claim 7, 14).
2. Manufacturing Parameters: Key process variables during cartridge assembly.
3. Quality Control Checks: Results of pre-deployment thermal performance tests, dimensional accuracy, and insulation integrity.
4. Operational Performance Log: Real-time operational data (e.g., power consumption, detected surface temperature profiles, hours of operation, number of replacements) collected by IoT sensors (Derivative 4.2) are periodically hashed and linked to the cartridge's blockchain record.
5. Maintenance History: Records of any repairs, calibrations, or inspections.
This distributed ledger ensures that the full history and performance of each cartridge are verifiable and tamper-proof, enabling better inventory management, predictive maintenance, and quality control, especially important for "replaceable" components (Claim 8, 15) whose performance directly impacts glass quality.

sequenceDiagram
    participant M as Manufacturer
    participant Q as QA Dept
    participant S as Shipping
    participant G as Glass Factory
    participant I as IoT Sensors
    participant B as Blockchain Ledger

    M->>B: Register Cartridge ID & Materials Hash
    Q->>B: Add Manufacturing & QC Data Hash
    S->>B: Record Shipment & Delivery Hash
    G->>B: Record Installation Date Hash
    I->>B: Periodically Add Operational Data Hashes
    G->>B: Record Replacement/Disposal Hash
    alt Verification
        G->>B: Query Cartridge History
        B->>G: Provide Immutable Log
    end

5. The "Inverse" or Failure Mode

Derivative 5.1: Fail-Safe Low-Power "Idle" Mode with De-energized Shielding

Enabling Description:
The replaceable heating cartridge (Claim 8, 15) is designed with a fail-safe low-power "idle" mode activated upon detection of critical system faults (e.g., loss of cooling to edge rollers, catastrophic failure of a primary heating element, or unstable molten glass flow). In this mode, the main heating elements (Claim 8) are partially or fully de-energized to prevent overheating of the edge director or adjacent glass. However, the thermal shielding function (Claim 1, 8, 15) is maintained, albeit in a passive, reduced capacity. This is achieved by ensuring the refractory material (Claim 8) and the structural components of the enclosure remain physically positioned between the edge director and edge rollers. Additionally, a secondary, low-power resistive heating trace (e.g., a low-mass, high-resistance wire) embedded in the heat-directing surface can maintain a minimal "keep-warm" temperature to prevent extreme thermal shock to the edge director, allowing for a more graceful shutdown or recovery without immediate total loss of the glass ribbon.

stateDiagram-v2
    state "Normal Operation" as Normal
    state "Fault Detected" as Fault
    state "Low-Power Idle Mode" as Idle
    state "Heating Elements De-energized" as HE_Off
    state "Passive Thermal Shield Active" as PassiveShield
    state "Keep-Warm Trace Active (Optional)" as KeepWarm

    Normal --> Fault : Critical System Fault
    Fault --> Idle : Activate Fail-Safe Protocol
    Idle --> HE_Off
    Idle --> PassiveShield
    Idle --> KeepWarm
    HE_Off --> EdgeDirector : Reduced Heat
    PassiveShield --> EdgeRollers : Reduced Shielding (Passive)
    KeepWarm --> EdgeDirector : Minimal Heat

Derivative 5.2: Adaptive "Limited-Functionality" Mode with Redundant Heating Zones

Enabling Description:
The replaceable heating cartridge (Claim 8) incorporates a plurality of independently controllable heating elements, configured in spatially distinct zones on the heat-directing surface. Upon detection of a partial failure in one or more heating elements (e.g., open circuit, localized overheating), the system transitions into a "limited-functionality" mode. An onboard controller (or the main apparatus controller, Claim 1, 15) isolates the failed element(s) and dynamically re-distributes power to the remaining functional heating zones. The inclined angle of the heat-directing surface (Claim 8) and its overall position (Claim 1, 15) are maintained. The control system may adjust overall glass ribbon draw speed or other process parameters (e.g., molten glass temperature upstream) to compensate for the reduced, uneven heating capability at the edge director. While not operating at peak efficiency, this mode prolongs the cartridge's operational life until a scheduled replacement (Claim 15), preventing immediate catastrophic failure and enabling continued, albeit degraded, glass production.

graph TD
    subgraph Replaceable Heating Cartridge
        direction LR
        HCA[Heating Control Architecture]
        HZ1[Heating Zone 1]
        HZ2[Heating Zone 2]
        HZ3[Heating Zone 3]
        HD[Heat Directing Surface]
        HCA -- Power Distribution --> HZ1 & HZ2 & HZ3
        HZ1, HZ2, HZ3 --> HD
    end
    F[Failure Detected in HZ1] --> HCA
    HCA -- Isolate HZ1 & Re-distribute Power --> HZ2, HZ3
    HCA --> O[Process Optimization Logic]
    O -- Adjusts --> G[Glass Ribbon Draw Speed]
    O -- Adjusts --> M[Upstream Molten Glass Temp]
    HD --> E[Edge Director]

Derivative 5.3: Reverse Thermal Gradient "Quench Director" Cartridge

Enabling Description:
Instead of solely directing heat, a derivative of the replaceable heating cartridge (Claim 8) is envisioned as a "Quench Director" cartridge, specifically designed to induce a controlled reverse thermal gradient for ultra-rapid quenching of molten glass edges under certain process conditions (e.g., forming specialty glasses requiring extreme rapid cooling to suppress crystallization). This cartridge features an inclined "cooling directing surface" (analogous to heat directing surface, angle <90°). Instead of heating elements, it contains high-efficiency micro-channel liquid cooling loops or impingement jets for cryogenically cooled inert gas (e.g., liquid nitrogen vapor). The surface itself is highly thermally conductive (e.g., copper-tungsten alloy) to maximize heat extraction from the glass edge. The "thermal shielding" function (Claim 1, 8, 15) is inverted; the cartridge is positioned to shield the rapidly quenched glass edge from ambient heat sources or slower-cooling adjacent areas of the glass ribbon, ensuring a uniform and rapid quench profile across the edge. This provides precise, controlled localized cooling rather than heating.

flowchart TD
    A[Molten Glass Flow] --> B[Forming Wedge]
    B --> C[Edge Director]
    C --> D[Glass Ribbon Edge]
    E[Quench Director Cartridge] -- Extracts Heat --> C
    E -- Thermally Shields From --> F[Ambient Heat / Slower Cooling Zones]
    E -- Micro-Channel Cooling / Cryogenic Jets --> G[Coolant Supply]
    G -- Control System --> H[Quench Director Cartridge]

Combination Prior Art Scenarios

Here are at least three "Combination Prior Art" scenarios where US Patent 9512025 (or its core inventive concepts) is combined with existing open-source standards. This demonstrates how the disclosed invention, when combined with widely available knowledge, could lead to obvious improvements.

Scenario 1: US9512025 with Open-Source Robotics and Machine Vision Standards for Automated Cartridge Replacement

Enabling Description:
The "replaceable heating cartridge" (Claim 8, 15) and its "removably positioned" nature (Claim 1) are combined with Robot Operating System (ROS), an open-source framework for robot software development, and OpenCV (Open Source Computer Vision Library), an open-source computer vision library.
The automation involves:

1. Detection of Cartridge Wear/Failure: IoT sensors (as in Derivative 4.2) and machine vision cameras integrated into the housing (Claim 1) continuously monitor the heat-directing surface (Claim 8) for signs of wear, degradation, or deviation in temperature profile. OpenCV algorithms process visual data to detect cracks, material erosion, or localized hot spots.
2. Autonomous Replacement Task Planning: Upon detection of a predefined degradation threshold, an industrial robotic arm, running control software based on ROS, initiates a cartridge replacement sequence. ROS nodes manage path planning, gripper control, and collision avoidance within the glass forming apparatus.
3. Precision Cartridge Installation: The robotic arm, guided by real-time visual feedback from stereo cameras and OpenCV's object recognition (locating the port and aligning the cartridge, Claim 1), precisely removes the degraded cartridge and installs a new one. The new cartridge's identity is verified via an NFC reader (as in Derivative 4.3 for blockchain) before installation.
   This combination automates the replacement process, reducing human intervention, speeding up maintenance, and improving consistency, thereby enhancing the "replaceable" aspect of the invention.

sequenceDiagram
    participant S as IoT Sensors & Vision Cameras
    participant OC as OpenCV Algorithms
    participant RS as ROS Robot Control
    participant RH as Robotic Arm
    participant HC as Heating Cartridge (Degraded)
    participant NHC as New Heating Cartridge
    participant HP as Housing Port

    S->>OC: Image & Thermal Data
    OC->>RS: Detect Degradation/Failure
    RS->>RH: Plan Replacement Path
    RH->>HP: Detach HC
    RH->>HP: Insert NHC
    RS->>OC: Verify New Cartridge Alignment
    OC->>RS: Confirmation

Scenario 2: US9512025 with OPC UA (Open Platform Communications Unified Architecture) for Standardized Process Control Integration

Enabling Description:
The apparatus for making a glass ribbon (Claim 1) and its method of heating (Claim 15) the edge director with a replaceable heating cartridge (Claim 8) are integrated into a broader industrial control system using the OPC UA (Open Platform Communications Unified Architecture) open-source standard.

1. Standardized Data Exchange: The controller (180, described in the patent) for the heating cartridge power, thermal sensors (182), and other process parameters (e.g., edge roller speed, molten glass flow rate) publishes its data and exposes its control functions as OPC UA services. This enables seamless, secure, and vendor-agnostic data exchange with other automation systems (e.g., plant-wide SCADA, MES, or ERP systems).
2. Interoperable Control: Third-party control applications can monitor the "thermal characteristic" (Claim 15) of the edge director, heat-directing surface, and edge rollers, and issue commands to adjust heating cartridge power or other parameters (as per Derivative 4.1's AI system) using standardized OPC UA client interfaces.
3. Remote Monitoring & Diagnostics: Operators and maintenance personnel can remotely access real-time and historical performance data of the heating cartridges and edge directors, enabling predictive maintenance and optimization across multiple glass forming lines, leveraging the robust security and data modeling capabilities of OPC UA.

graph LR
    subgraph Glass Forming Apparatus (US9512025)
        C[Controller 180] --- HC[Heating Cartridge 110a]
        C --- TS[Thermal Sensor 182]
        C --- ER[Edge Rollers 132]
    end
    C -- OPC UA Server --> GW(OPC UA Gateway)
    GW -- Data Exchange --> SC(SCADA System)
    GW -- Control Commands --> MES(MES System)
    GW -- Data Access --> ERP(ERP System)
    GW -- Remote Monitor --> OPS[Remote Operator Workstation]

Scenario 3: US9512025 with Open-Source Data Visualization Libraries and Cloud Platforms for Performance Benchmarking

Enabling Description:
The method of making a glass ribbon (Claim 15) and specifically the operational data from the replaceable heating cartridge (Claim 8) are processed and visualized using open-source data visualization libraries (e.g., D3.js, Plotly.js, or Grafana with open-source backend databases like InfluxDB) integrated with open-source cloud platforms (e.g., OpenStack, Kubernetes).

1. Data Ingestion and Storage: Real-time thermal feedback (Claim 15) from multiple edge directors and their associated heating cartridges across various glass forming lines is ingested via MQTT (Message Queuing Telemetry Transport, an open-source IoT protocol) into a distributed time-series database running on an open-source cloud infrastructure.
2. Interactive Performance Dashboards: Customized dashboards built with D3.js or Grafana display critical metrics such as edge director temperature uniformity, heating cartridge power consumption, view factor efficiency, and predicted devitrification rates. These dashboards allow engineers to interactively analyze trends, compare performance against benchmarks, and identify optimal operating points.
3. Community-Driven Optimization: By anonymizing and aggregating performance data (e.g., for specific glass types or machine configurations) and sharing it (within a controlled consortium) via open-source tools, a community of users could collaboratively identify best practices and propose improvements to cartridge designs or operational methodologies, driving continuous improvement of the core invention's application.

graph TD
    A[Heating Cartridge 110a] --> B{IoT Gateway}
    C[Thermal Sensor 182] --> B
    D[Edge Director 80a] --> B
    B -- MQTT --> E(Open-Source Cloud Platform)
    E -- Ingests Data --> F[Time-Series DB (InfluxDB)]
    F --> G[Data Processing & Analytics]
    G -- Queries & APIs --> H[Visualization Libraries (D3.js/Plotly.js)]
    G -- Dashboarding --> I[Grafana Dashboards]
    H,I --> J[Engineer/Operator Interface]
    J -- Insights & Optimization --> A,C,D