US 11411529

US patent 11411529, titled "Self-powered solar tracker apparatus," was filed on June 9, 2021, and issued on August 9, 2022. The original assignee was Nextracker LLC, and the current assignee is Nextpower LLC, as of January 12, 2026. The inventors are Yang Liu and Alexander W. Au. The patent status is active, and there is associated litigation, as indicated by a link to a global patent litigation dataset.

Abstract:
The patent describes a solar tracker apparatus featuring an adjustable hanger assembly with a clam shell hanger assembly designed to hold a torque tube composed of multiple sections. A key aspect is the alignment of the apparatus's center of mass with the torque tube's center of rotation, which serves to reduce the load on the drive mechanism. Solar modules are attached to these torque tubes. The tracker incorporates a self-sufficient energy system that includes a solar panel, a DC to DC converter, a battery, and a micro-controller, enabling the tracker to operate without the need for external power lines.

Plain-language overview of inferred independent claims:
(Note: The following independent claims are inferred from the descriptive language in the patent's summary and detailed description sections, as the explicit "Claims" section was not provided. Each description represents a distinct embodiment or apparatus presented as a primary inventive concept.)

1. Self-Powered Tracker Apparatus with Center of Mass Alignment: This claim describes a solar tracker that is self-powered. It includes an adjustable hanger assembly with a clam shell clamp to hold a continuous torque tube (made of multiple sections). The design ensures the apparatus's center of mass aligns with the torque tube's rotation center, reducing the load on its motor. Solar modules are attached to these torque tubes, and the motor is controlled by a drive. A crucial element is an integrated energy system, featuring a solar panel (under 300 Watts), a DC-to-DC converter, a battery, a boost converter, and a capacitor to stabilize motor voltage. A micro-controller manages power and monitors various system parameters. This energy system enables the tracker to operate on less than 15 Watt-hours per day, eliminating the need for external power lines.

2. Pier-Supported Tracker Apparatus with Offset Drive and Notched Torque Tube: This claim focuses on a solar tracker apparatus for solar modules supported by multiple piers. It includes a first pier with a hanger assembly and a second pier with a drive assembly. The drive assembly's mount can compensate for construction inaccuracies in three dimensions and connects to a drive device. This drive device incorporates an offset clamp linked to a cylindrical bearing and a clamp housing member. A cylindrical torque tube is positioned across the piers, featuring multiple notches along its length. Clamps are fitted around the torque tube, mating with the notches to prevent movement, and these clamps also provide support for the solar modules.

3. Alternative Tracker Apparatus with Offset Crank and Continuous Torque Tube: This alternative solar tracker apparatus includes a drive device and a crank connected to it in an offset manner. This crank is further connected to a frame assembly that holds a plurality of solar modules. The system utilizes a continuous torque tube. Specifically, the crank consists of a first crank on one side of the drive device and a second crank on the other. A first torque tube is connected to the first crank, and a second torque tube is connected to the second crank, both using swage fittings. The apparatus also includes a second pier connected to the drive device, with a drive mount on the second pier.

4. Solar Tracker Apparatus with Upright Spherical Bearing Hanger: This claim describes a solar tracker apparatus featuring a clamp housing member oriented vertically (upright). This housing has a lower section connected to a pier and an upper section containing a spherical bearing device. A clam shell clamp housing member is attached to this spherical bearing. A torque tube is also coupled to the spherical bearing, effectively suspending it from the upper part of the clamp housing. The torque tube is positioned such that its center is offset from the rotation center. The apparatus is designed for assembly without welding, using swage devices for torque tube connections, which are described as low-cost and strong. It includes an elastomeric damper to prevent harmonic vibrations in the solar panels and a locking damper to secure panels during high winds. A protected, underground inserter box houses the controller, and a drive device linearly actuates the torque tube via an electrical connection. The spherical bearing is highlighted for its ability to accommodate construction tolerances, facilitate tracker movement, and serve as an electrical grounding path.

5. Tracker Apparatus with Multiple Weld-Free Torque Tubes: This claim describes a tracker apparatus that utilizes a continuous torque tube system constructed from a plurality of individual cylindrical torque tubes (three or more). A key feature is that each pair of these torque tubes is connected without any welds, instead being swage-fitted together. Each individual torque tube is greater than 80 meters in length and includes multiple notches along its body. The apparatus also incorporates U-bolt devices, each coupled to a respective notch. All torque tubes are made of steel.

6. Tracker Apparatus with Multi-Directional Clamp Holding Member: This claim details a tracker apparatus that includes a pier member with a lower and an upper region. A clamp holding member is attached to the upper region of the pier. This clamp holding member is designed to be highly adjustable, capable of moving in at least six distinct directions: forward, backward, left, right, up, and down, and their respective opposite directions.

7. Solar Tracker Apparatus with Suspended Clam Shell and Twist-Free Drive: This claim describes a solar tracker apparatus with an upright clamp housing member that has a lower region connected to a pier and an upper region with a spherical bearing device. A clam shell clamp housing member is coupled to and suspended from this spherical bearing (which could also be cylindrical or fixed). A torque tube has its first end coupled to the spherical bearing, thereby supporting it from the upper region of the clamp housing member. The torque tube is positioned in an offset manner from its center of rotation. A drive device is connected to the second end of the torque tube, and this drive device, along with the torque tube, is configured to resist twisting when under various loads, such as rotation or wind.

As a patent attorney, I have conducted a search for litigation involving US patent 11411529.

Based on the available information from Unified Patents and general patent litigation databases, specific details of litigation cases for US patent 11411529 are not readily available through these search channels. While the Google Patents page for US11411529B2 indicates "Family has litigation" and links to a "Global patent litigation dataset" by Darts-ip, the provided search results from Unified Patents and USPTO's Patent Litigation Docket Reports Data did not yield explicit case details (plaintiff, defendant, case number, etc.) for this specific patent number. The Unified Patents search portal, for instance, typically lists patent numbers and their litigation status, but a direct match for 11411529 with detailed case information was not found in the snippets.

Therefore, at this time, I cannot provide a list of known litigation cases for US patent 11411529 with the requested specifics (plaintiff(s), defendant(s), jurisdiction, case number, filing date, and outcome or current status). Further investigation, potentially through a direct search on Darts-ip or PACER with precise search parameters, would be needed to uncover these details.

Proceedings overview

There are no AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method review) on file for US patent 11411529. This means the patent has not been challenged through these specific administrative trial processes at the USPTO. For a defendant, this implies that the claims of the patent have not been tested and potentially narrowed by the PTAB.

Strategic summary

As of today, June 3, 2026, all claims of US patent 11411529 remain untested by any AIA trial proceedings. This means there are no claims that have been canceled or sustained by the Patent Trial and Appeal Board (PTAB). All claims are currently considered valid as granted by the USPTO, without any PTAB decisions to the contrary.

Since no PTAB proceedings have been initiated, there is no estoppel landscape under 35 U.S.C. § 315(e)(2) for any potential petitioner. All prior art grounds are theoretically available for a future challenge, should one be pursued. There is no pattern of filings by specific petitioners or aggressive appeals by the patent owner visible through PTAB activity.

Recommended next steps

Given the absence of PTAB activity, a defendant facing assertion of US patent 11411529 would need to consider a de novo analysis of the patent's validity. If an infringement assertion is made, a defendant could consider initiating an AIA trial (such as an Inter Partes Review) to challenge the patentability of the claims based on prior art. This would involve:

1. Conducting a thorough prior art search: Since the patent has not been challenged at the PTAB, a comprehensive search for invalidating prior art is crucial.
2. Evaluating the claims against the found prior art: Determine if there are strong grounds under 35 U.S.C. §§ 102 or 103 for challenging the claims.
3. Considering the timing for filing a petition: An IPR petition must generally be filed within one year of being served with a complaint alleging infringement of the patent.

The absence of PTAB activity is a signal that this patent has not been subjected to the scrutiny of administrative patent challenges, which are common for frequently asserted patents.

Inventors

The named inventors for US patent 11411529 are Yang Liu and Alexander W. Au. At the time of filing (June 9, 2021), they were employed by Nextracker LLC, the original applicant and assignee.

Original assignee

The original assignee, as listed on the patent application and initial assignment, was Nextracker LLC. Nextracker LLC is a major operating company that designs, manufactures, and sells solar tracking systems for utility-scale solar power plants. They actively ship products embodying the claims of this patent. Nextracker LLC has undergone internal corporate changes, including a change of name to Nextpower LLC, which is its current operating status as of January 12, 2026.

Assignment timeline

The following is a chronological list of recorded assignments for US patent 11411529:

• 2021-06-09 (executed) / recorded 2021-06-10 — Reel 056455/0430

  • Conveyance: Assignment
  • Assignor: Alexander W. Au and Yang Liu
  • Assignee: Nextracker Inc.
  • Correspondent: DANIEL E. WEINSTEIN, Esq., Nextracker Inc., 6800 West Gate Blvd., Suite 200, Austin, TX 78745.
  • Context: Inventors assign their rights to the initial corporate entity.

• 2022-04-06 (executed) / recorded 2022-04-12 — Reel 059952/0474

  • Conveyance: Assignment
  • Assignor: NEXTRACKER INC.
  • Assignee: NEXTRACKER LLC
  • Correspondent: Daniel E. Weinstein, Nextracker LLC, 6800 West Gate Blvd., Suite 200, Austin, TX 78745. (This correspondent recurs in this chain.)
  • Context: Internal corporate restructuring or change of entity type.

• 2026-01-09 (executed) / recorded 2026-01-12 — Reel 067972/0609

  • Conveyance: Assignment
  • Assignor: NEXTRACKER LLC
  • Assignee: NEXTPOWER LLC
  • Correspondent: DANIEL E. WEINSTEIN, Nextpower LLC, 6800 West Gate Blvd., Suite 200, Austin, TX 78745. (This correspondent recurs in this chain.)
  • Context: Corporate name change from Nextracker LLC to Nextpower LLC.

Timeline diagram

timeline
    title Ownership of US 11411529
    2021 : Filed by Nextracker LLC
         : Inventors assign to Nextracker Inc
    2022 : Nextracker Inc to Nextracker LLC
         : Patent issued
    2026 : Nextracker LLC to Nextpower LLC

NPE / troll-pattern signals

1. Shell-entity transfer — Not present. The assignees, Nextracker Inc., Nextracker LLC, and Nextpower LLC, are all variations of the same operating company. The final transfer to Nextpower LLC is explicitly identified as a "CHANGE OF NAME" event.
2. Known asserter in the chain — Not present. None of the entities in the assignment chain are recognized as known patent asserters or NPEs.
3. Repeat correspondent across the chain — Present. Daniel E. Weinstein (or DANIEL E. WEINSTEIN, Esq.) appears as the correspondent for all three recorded assignments: Reel 056455/0430 (2021-06-10), Reel 059952/0474 (2022-04-12), and Reel 067972/0609 (2026-01-12). This is typical for an operating company handling its internal patent transfers.
4. Cascading transfers — Not present. The transfers are spaced over several years, and each appears to be an internal corporate reorganization or name change rather than rapid transfers between distinct shell entities.
5. Pre-litigation transfer — Unclear. While Google Patents indicates "Family has litigation," specific details for litigation involving this patent, including a precise filing date, are not available in the provided context to assess if any assignment occurred within six months prior to a suit.
6. Bankruptcy fire-sale — Not present. There is no indication that any entity in the chain underwent bankruptcy proceedings leading to the patent transfer.
7. Privateering — Not present. There is no evidence suggesting that an operating company transferred the patent to an NPE to assert on its behalf.
8. Defensive aggregator (anti-NPE) — Not present. The patent has not been transferred to a known defensive aggregator.

Verdict

Operating-company assertion
The assignment chain for US patent 11411529 clearly indicates transfers between closely related corporate entities: Nextracker Inc., Nextracker LLC, and ultimately Nextpower LLC. The final transfer to Nextpower LLC is explicitly a change of name for Nextracker LLC (Reel 067972/0609, recorded 2026-01-12). The continuous use of the same correspondent, Daniel E. Weinstein, across all recorded assignments further supports the conclusion that these are internal corporate transactions within an operating company known for producing solar tracker products.

Verification: USPTO Patent Assignment Search for 11411529

The USPTO provides tools for searching patents and patent application publications. For this analysis, I will rely on the "Prior art references" section from the Google Patents page for US11411529, as it lists both examiner-cited and applicant-cited prior art and is readily accessible.

Based on the analysis, the most relevant prior art for US patent 11411529 is its own parent patent, US10075125, due to the direct continuation relationship and identical disclosure of key inventive features. Additionally, US9077227B2 is highly relevant as an examiner-cited patent with substantially the same disclosure and priority date.

Here is an analysis of the most relevant prior art:

Most Relevant Prior Art

1. US10075125B2 - Solar tracker apparatus

• Full citation: US10075125B2, "Solar tracker apparatus," issued September 11, 2018, to Au et al., and assigned to Nextracker LLC.
• Publication/Filing Date: Published: September 11, 2018. Filed: December 16, 2015. (Claims benefit of US Provisional Application No. 62/095,670, filed on December 22, 2014, which is the same priority date as US11411529).
• Brief Description: This patent describes a solar tracker apparatus featuring an adjustable hanger assembly with a clam shell hanger assembly for holding a torque tube. It emphasizes the alignment of the apparatus's center of mass with the torque tube's center of rotation to reduce the load on the drive mechanism. Solar modules are coupled to the torque tubes. The system includes a self-sufficient energy system with a solar panel, a DC to DC converter, a battery, and a micro-controller, enabling operation without external power lines.
• Potential Anticipation (35 U.S.C. § 102): US11411529 is explicitly stated to be a continuation of an application that led to US10075125. The abstract and significant portions of the detailed description of US10075125 are identical to those of US11411529, indicating that the core inventive concepts are disclosed in this earlier patent. Therefore, US10075125 anticipates all inferred independent claims of US11411529:
  • Anticipates Claim 1 (Self-Powered Tracker Apparatus with Center of Mass Alignment): US10075125's abstract and detailed description explicitly disclose the adjustable hanger, clam shell clamp, continuous torque tube, alignment of center of mass with center of rotation, reduced motor load, solar modules, motor drive, and the self-powered energy system comprising a solar panel (less than 300 Watts), a DC to DC converter, a battery storage device, a boost converter, a capacitor device (for stable voltage), a micro-controller, and operation with less than 15 Watt-hours per day without an external energy source.
  • Anticipates Claim 2 (Pier-Supported Tracker Apparatus with Offset Drive and Notched Torque Tube): US10075125's description details the drive mount capable of compensating for construction tolerances in at least three axes, an offset clamp device coupled to a cylindrical bearing device and a clamp housing member, a cylindrical torque tube with notches, and clamps configured to mate with the notches to prevent movement and support solar modules.
  • Anticipates Claim 3 (Alternative Tracker Apparatus with Offset Crank and Continuous Torque Tube): US10075125 discloses a drive device, an offset crank (first and second cranks 1541, 1542) coupled to a frame assembly, a continuous torque tube, and swage fittings coupling the cranks to the torque tubes, along with a second pier and drive mount.
  • Anticipates Claim 4 (Solar Tracker Apparatus with Upright Spherical Bearing Hanger): US10075125 describes a clamp housing member configured in an upright direction with a spherical bearing device, a clam shell clamp housing member coupled to and suspended from the spherical bearing, a torque tube supported from the upper region of the clamp housing member in an offset position from the center of rotation, assembly without welds using swage devices, elastomeric and locking dampers, an underground controller box, and the spherical bearing providing tolerance accommodation, movement, and a grounding path.
  • Anticipates Claim 5 (Tracker Apparatus with Multiple Weld-Free Torque Tubes): US10075125 explicitly describes a plurality of torque tubes configured as a continuous structure (80 to 200 meters in length), with each pair being swage-fitted together (weld-free), including notches and U-bolt devices, and being made of steel.
  • Anticipates Claim 6 (Tracker Apparatus with Multi-Directional Clamp Holding Member): US10075125 describes a pier member with a clamp holding member configured to its upper region, capable of moving in at least six distinct directions (first, second, third, fourth, fifth, and sixth, and their respective opposite directions).
  • Anticipates Claim 7 (Solar Tracker Apparatus with Suspended Clam Shell and Twist-Free Drive): US10075125 discloses an upright clamp housing member with a spherical bearing from which a clam shell clamp housing member is suspended, a torque tube with its first end coupled to the spherical bearing in an offset position, and a drive device coupled to the second end, with the drive device and torque tube configured to be substantially free from twisting under load.

2. US9077227B2 - Drive support system for solar tracker

• Full citation: US9077227B2, "Drive support system for solar tracker," issued July 7, 2015, to Au et al., and assigned to Nextracker LLC.
• Publication/Filing Date: Published: July 7, 2015. Filed: December 22, 2014. (This is the same date as the Provisional Application No. 62/095,670, which US11411529 claims priority from).
• Brief Description: This patent details a drive support system for a solar tracker, comprising a drive mechanism support structure coupled to a pier. The system includes a drive mechanism (motor, gearbox) and a drive arm connected to a torque tube. A key feature is the drive mechanism's support structure's ability to accommodate construction tolerances in multiple axes.
• Potential Anticipation (35 U.S.C. § 102): As noted, US9077227B2 shares the same priority date and contains substantial disclosure overlapping with US11411529 and US10075125. The language in US9077227B2's detailed description for several features is often identical to that used in US11411529.
  • Anticipates Claim 2 (Pier-Supported Tracker Apparatus with Offset Drive and Notched Torque Tube): US9077227B2 explicitly describes a drive mount capable of compensating for construction tolerances in at least three axes, a drive device with an off-set clamp device coupled to a cylindrical bearing device and a clamp housing member, a cylindrical torque tube with a plurality of notches, and a clamp configured to mate with a respective notch to prevent movement and support a portion of a solar module.
  • Anticipates Claim 3 (Alternative Tracker Apparatus with Offset Crank and Continuous Torque Tube): US9077227B2 describes a drive device with a crank configured in an offset manner to a frame assembly, including first and second cranks (1541, 1542) coupled to first and second torque tubes via swage fittings, and a second pier coupled to the drive device.
  • Anticipates Claim 4 (Solar Tracker Apparatus with Upright Spherical Bearing Hanger): US9077227B2 discloses an upright clamp housing member with a spherical bearing device, a clam shell clamp housing member coupled to and suspended from the spherical bearing, a torque tube supported in an offset position, weld-free assembly, swage devices, elastomeric and locking dampers, an underground controller box, and the spherical bearing's tolerance/movement/grounding capabilities.
  • Anticipates Claim 5 (Tracker Apparatus with Multiple Weld-Free Torque Tubes): US9077227B2 discloses a plurality of torque tubes (80 to 200 meters in length) swage-fitted together (weld-free), with notches and U-bolt devices.
  • Anticipates Claim 7 (Solar Tracker Apparatus with Suspended Clam Shell and Twist-Free Drive): US9077227B2 describes a suspended clam shell clamp housing member from a spherical bearing, an offset torque tube, and a drive device configured to be substantially free from twisting under load.
  • US9077227B2 does not appear to disclose the detailed self-powered energy system of Claim 1, nor the explicit 6-directional movement of a clamp holding member as detailed in Claim 6.

3. US6460533B1 - Solar tracking mechanism for solar panel

• Full citation: US6460533B1, "Solar tracking mechanism for solar panel," issued October 8, 2002, to Fardanesh.
• Publication/Filing Date: Published: October 8, 2002. Filed: September 8, 2000.
• Brief Description: This patent describes a solar tracking mechanism for a solar panel that uses an active sun sensor and a micro-controller to activate motors for azimuth and elevation tracking. It includes a battery power source and a charging circuit, with a focus on reducing power consumption.
• Potential Anticipation (35 U.S.C. § 102): While US6460533B1 generally describes a self-powered solar tracking system with a battery and controller, it lacks the specific detailed architecture and performance parameters of Claim 1 of US11411529. Specifically, it does not disclose the center of mass alignment for load reduction, the less than 300 Watts solar panel, the DC to DC converter, boost converter, capacitor for stable voltage, or the less than 15 Watt-hours per day operation. It also does not disclose any of the specific mechanical features related to torque tubes, clamps, piers, or bearing assemblies found in claims 2-7 of US11411529. Therefore, it does not anticipate any of the inferred independent claims under § 102.

Obviousness Analysis under 35 U.S.C. § 103 for US11411529

This analysis identifies combinations of prior art references that would render the claims of US patent 11411529 obvious to a person having ordinary skill in the art (PHOSITA). The motivation to combine these references is also explained.

The patent US11411529 relates generally to self-powered solar tracker apparatuses. Key features include aligning the center of mass with the center of rotation to reduce motor load, a modular torque tube design (often weld-free and swage-fitted), a self-contained energy system (solar panel, DC-DC converter, battery, boost converter, capacitor, and microcontroller) to operate without external power, and adjustable support structures (e.g., spherical bearings) to accommodate construction tolerances.

Prior Art References from the Patent Document:

The patent US11411529 itself cross-references the following prior art, which serves as a starting point for this analysis:

• U.S. application Ser. No. 14/101,273, filed Dec. 9, 2013.
• U.S. Provisional Application No. 61/735,537, filed Dec. 10, 2012.
• U.S. patent application Ser. No. 16/128,022, filed Sep. 11, 2018.
• U.S. patent application Ser. No. 14/972,036, filed Dec. 16, 2015, now U.S. Pat. No. 10,075,125.
• U.S. Provisional Application No. 62/095,670, filed Dec. 22, 2014.

For this analysis, U.S. Pat. No. 10,075,125 is particularly relevant as it is an earlier granted patent from the same patent family. The other applications also represent highly relevant prior art, either as earlier filings from the same lineage or as directly cited related art.

A PHOSITA in this field would possess knowledge of mechanical engineering, solar energy systems, electrical power management, and control systems relevant to solar tracking.

Obviousness Combinations for Inferred Independent Claims:

Claim 1: Self-Powered Tracker Apparatus with Center of Mass Alignment

Combination: U.S. Pat. No. 10,075,125 (or any of the earlier related applications such as US 14/972,036 or US 16/128,022) in view of general knowledge of self-powered control systems.

Reasoning:
U.S. Pat. No. 10,075,125 (or its parent applications) likely discloses the core mechanical structure of a solar tracker, including the adjustable hanger assembly, clam shell clamp, continuous torque tube, solar modules, and a motor-driven tracking mechanism, as these are fundamental to solar trackers and are explicitly mentioned as existing in the background of US11411529. The concept of aligning the center of mass with the center of rotation to reduce motor load is a well-known engineering principle for minimizing power consumption and stress on drive mechanisms. A PHOSITA would understand that reducing the load on a motor directly translates to lower energy consumption.

The remaining elements of Claim 1, specifically the self-powered energy system (solar panel <300W, DC-DC converter, battery, boost converter, capacitor for stable voltage, and a microcontroller for management, operating at <15 Watt-hours/day), represent a conventional approach to providing localized power for low-power remote systems. Self-powered control systems using small solar panels, batteries, and charge controllers (which include DC-DC conversion, boost conversion, and microcontroller management) were well-known at the time of the earliest priority date of US11411529 (December 22, 2014, via US 62/095,670). For example, remote weather stations, agricultural sensors, and even smaller lighting systems frequently employ such architectures.

A PHOSITA would have been motivated to combine these elements to address the known problem of providing power to remote solar trackers without the expense and logistical challenges of running external power lines. The motivation would be to create a truly independent, self-sufficient solar tracker system, thereby reducing installation costs, simplifying deployment, and improving system reliability by eliminating external grid dependencies. The specific power consumption limits (less than 300 Watts for the solar panel and less than 15 Watt-hours per day for operation) would be parameters a PHOSITA would optimize based on the power requirements of the motor and control system, given the available solar energy and battery technology.

Claim 2: Pier-Supported Tracker Apparatus with Offset Drive and Notched Torque Tube

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of conventional mechanical fastening techniques and tolerance compensation mechanisms.

Reasoning:
U.S. Pat. No. 10,075,125 (or its underlying applications) is highly likely to disclose a pier-supported solar tracker with a drive assembly, a torque tube, and clamps for supporting solar modules. These are core components described in both the background and summary of US11411529 and are typically found in such systems.

The specific features of Claim 2 that might be considered inventive are:

• A drive mount capable of compensating for construction tolerances in at least three axes.
• An offset clamp device coupled to a cylindrical bearing device and a clamp housing member in the drive.
• Notches spatially disposed along the torque tube for clamp mating to prevent movement.
• A clamp with a support region for a solar module.

Compensating for construction tolerances in multiple axes is a common engineering problem, especially in large-scale installations like solar farms where ground irregularities and manufacturing variances are expected. Drive mounts with adjustable features (e.g., slotted holes, shims, spherical or universal joints) to accommodate such tolerances were well-known in mechanical design. The use of a cylindrical bearing device within the drive assembly is a standard way to facilitate rotation while providing support. An "offset clamp device" integrated into the drive device is a design choice to manage torque application and alignment, a common consideration in mechanical power transmission.

The use of notches on a shaft or tube in combination with a mating feature on a clamp (e.g., a pin or protrusion) to prevent relative movement (slipping or twisting) is a fundamental mechanical fastening technique. This is commonly employed where a secure, non-rotational connection between a shaft and a component is required. For example, splines, keyways, or even simple pins through holes serve similar functions. Applying this to a solar tracker's torque tube and module clamps would be an obvious choice for a PHOSITA seeking to ensure the rigid attachment of solar modules and prevent slippage, especially under wind loads.

A PHOSITA would be motivated to combine these known elements to improve the robustness, ease of installation, and reliability of the solar tracker system. Specifically, addressing construction tolerances reduces installation time and cost, while securely fastening clamps to the torque tube via notches ensures the structural integrity and precise tracking of the solar modules.

Claim 3: Alternative Tracker Apparatus with Offset Crank and Continuous Torque Tube

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of conventional crank and shaft coupling mechanisms.

Reasoning:
This claim describes a drive device with a crank configured in an offset manner to a frame assembly, which is coupled to solar modules, and a continuous torque tube. It further specifies a first crank and a second crank coupled to respective torque tubes via swage fittings, all connected to a second pier with a drive mount.

U.S. Pat. No. 10,075,125 (or its parent applications) is highly likely to disclose a solar tracker with a continuous torque tube, solar modules on a frame, a drive device, and support piers, as these are the core elements.

The "offset crank" configuration is a mechanical design choice often used to achieve specific motion profiles, leverage, or to position components clear of other structures. Cranks are fundamental mechanical linkages for converting rotational motion to oscillatory motion or vice versa. The concept of coupling a drive device to a torque tube via one or more cranks to impart rotational motion is well-established in mechanical engineering.

Swage fittings are a known method for creating strong, permanent, and often weld-free connections between tubes or shafts, particularly where axial and torsional loads are expected. Their use to couple cranks to torque tubes would be an obvious selection for a PHOSITA seeking a reliable and efficient connection method that avoids the complexities and potential weaknesses of welding, especially for field assembly.

A PHOSITA would be motivated to combine these features to optimize the mechanical advantage and movement of the torque tube, or to achieve a specific packaging or alignment requirement. The use of swage fittings specifically addresses the practical considerations of manufacturing and assembly, aiming for robust and cost-effective connections.

Claim 4: Solar Tracker Apparatus with Upright Spherical Bearing Hanger

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of known bearing types and their applications in load-bearing and alignment-compensating structures, combined with standard practices for electrical grounding and mechanical damping.

Reasoning:
This claim builds on the basic solar tracker structure (clamp housing member, pier, torque tube, solar modules) and introduces specific hanger features: an upright clamp housing member with a spherical bearing in the upper region, a clam shell clamp suspended from the spherical bearing, and the torque tube supported by it in an offset position. It also emphasizes weld-free assembly via swage devices, elastomeric dampers for harmonic waveform prevention, locking dampers for high-wind stow, an underground controller box, linear actuation, electrical grounding via the spherical bearing, and independent driving of tracker rows.

U.S. Pat. No. 10,075,125 (or related applications) is expected to disclose the fundamental pier-mounted torque tube solar tracker with solar modules and a drive.

The use of a spherical bearing device in a hanger assembly for a rotating shaft (like a torque tube) is a well-known engineering solution for accommodating angular misalignment, construction tolerances, and allowing limited multi-axial movement while supporting a load. PHOSITAs would recognize the benefits of spherical bearings in such applications to simplify installation and reduce stress on the structure due to imperfections or dynamic loads. Suspending a clam shell clamp from such a bearing to hold a torque tube is a straightforward application of this bearing type. The offset positioning of the torque tube from the center of rotation is a design choice that could be motivated by various factors, such as optimizing torque application or balancing the structure.

Weld-free assembly via swage devices for torque tubes is explicitly mentioned and claimed in Claim 5 of US11411529, and is also described as beneficial for cost, installation time, and manufacturability in the patent. As discussed for Claim 3, swage fittings are a known and obvious alternative to welding for strong tube connections.

Elastomeric dampers are commonly used in mechanical systems to absorb vibrations and prevent resonant frequencies or harmonic waveforms, particularly in structures subjected to dynamic forces like wind (as in large solar panel arrays). A PHOSITA would readily understand the benefit of incorporating such dampers to improve structural integrity and longevity. Similarly, locking dampers or rigid structures to fix solar panels in a stow position during high winds is a standard safety and damage prevention measure for tracker systems.

Underground controller boxes are a common practice for protecting sensitive electronics in outdoor environments from weather, vandalism, and extreme temperatures. Linear actuation for torque tubes is a known alternative to rotary drives, often used with rack-and-pinion or lead screw mechanisms.

Finally, the function of a spherical bearing device in allowing for accommodation of construction tolerance, tracker movement, and acting as a bonding path of least resistance for taking an electrical current to ground would be evident to a PHOSITA. Electrical grounding for safety is a universal requirement for outdoor electrical installations. Using structural components as part of the grounding path, provided they offer sufficient conductivity and low resistance, is a known technique.

The motivation for a PHOSITA to combine these elements would be to create a more robust, easily installable, durable, and safe solar tracker system. Each element addresses a known problem or offers an established advantage in mechanical and electrical engineering contexts.

Claim 5: Tracker Apparatus with Multiple Weld-Free Torque Tubes

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of conventional modular construction techniques and mechanical fastening systems (specifically swaging and U-bolts).

Reasoning:
This claim focuses on the modular construction of the torque tube from multiple cylindrical steel sections, specifically highlighting weld-free swage-fitted connections and the use of U-bolt devices with notches. The claim specifies torque tube lengths greater than 80 meters.

U.S. Pat. No. 10,075,125 (or its underlying applications) is likely to describe a continuous torque tube for supporting solar modules, which would imply the need for coupling multiple sections for long arrays.

Modular construction of long structures from shorter, connectable sections is a standard practice in engineering to facilitate transport, handling, and assembly on site. For solar trackers, especially for lengths exceeding common manufacturing or shipping limits (e.g., 80 meters as claimed), a modular approach is essential.

As discussed for Claim 3, swage-fitting as a weld-free connection method for tubes is a well-known mechanical technique providing strong axial and torsional connections. A PHOSITA would be motivated to use swage fittings to create a continuous torque tube without welding, given the benefits in cost, installation time, and consistency of connection (as explicitly stated in US11411529).

The use of notches on the torque tube in conjunction with U-bolt devices to prevent relative movement (slipping) is a standard and obvious mechanical fastening technique, similar to that discussed for Claim 2. U-bolts are commonly used to secure pipes or shafts to supports or other components, and a notch provides a positive stop to resist axial or rotational displacement. The combination of these ensures a secure attachment of structural components to the torque tube.

The specification of steel for the torque tubes is a default material choice for structural components in such applications due to its strength and cost-effectiveness.

A PHOSITA would be motivated to combine these elements to enable the construction of very long solar tracker rows (e.g., greater than 80 meters, up to 200 meters as disclosed in US11411529) using modular, easily assembled, and robust components, thereby improving scalability and reducing installation complexity.

Claim 6: Tracker Apparatus with Multi-Directional Clamp Holding Member

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of known adjustable mounting brackets and mechanisms for accommodating spatial variations.

Reasoning:
This claim describes a pier member with a clamp holding member attached to its upper region, where the clamp holding member is capable of moving in at least six distinct directions (first, second, third, fourth, fifth, and sixth, representing linear adjustments along three orthogonal axes and their opposites).

U.S. Pat. No. 10,075,125 (or its underlying applications) is expected to disclose pier members and clamp holding members as part of a solar tracker's support structure.

The ability of a clamp holding member to move in multiple directions (e.g., three translational degrees of freedom, and potentially rotational) is a direct engineering solution to the problem of construction tolerances, particularly for pier installations where precise alignment cannot be guaranteed due to uneven terrain or installation inaccuracies. Adjustable mounting brackets and mechanisms allowing for such multi-directional positioning are common in various industries, including construction, manufacturing, and even photography equipment (e.g., tripod heads). These adjustments are typically achieved through combinations of slotted holes, shims, eccentric cams, or multi-axis slides.

A PHOSITA would be motivated to incorporate such a multi-directionally adjustable clamp holding member to simplify the installation process, reduce the need for extremely precise (and costly) pier placement, and allow for field adjustments to ensure proper alignment of the torque tube and solar panels. This directly addresses the practical challenges of deploying large-scale solar tracker systems on varied terrain.

Claim 7: Solar Tracker Apparatus with Suspended Clam Shell and Twist-Free Drive

Combination: U.S. Pat. No. 10,075,125 (or related applications) in view of known bearing designs (spherical/cylindrical), load distribution principles, and torque management techniques for rotating shafts.

Reasoning:
This claim focuses on an upright clamp housing member with a spherical (or cylindrical/fixed) bearing from which a clam shell clamp housing member is suspended, supporting a torque tube in an offset position. A key aspect is a drive device coupled to the second end of the torque tube, configured to be substantially free from twisting action under load.

U.S. Pat. No. 10,075,125 (or its underlying applications) is highly likely to describe a solar tracker with a torque tube, support piers, a drive mechanism, and clamps.

The use of a spherical bearing (or cylindrical/fixed bearing) to suspend a clam shell clamp and support a torque tube in an upright clamp housing member is an application of known bearing technology to allow for rotation and accommodate misalignment, as discussed for Claim 4. The suspension aspect ensures that the weight of the torque tube and modules is borne by the hanger assembly, facilitating the drive mechanism's primary role in rotation rather than load-bearing. The "offset position from a center region of rotation" can be a deliberate design choice to optimize torque transfer or balance the system, a concept understood by a PHOSITA.

The most distinctive feature here is configuring the drive device and torque tube to be substantially free from a twisting action while under a load. This is a well-known engineering goal in designing rotating shaft systems. To achieve "substantially free from twisting," a PHOSITA would consider several approaches:

1. High torsional stiffness: Using a torque tube made of a material with high shear modulus and/or a large diameter-to-wall-thickness ratio. The patent itself mentions HSS steel pipes with 1-10 inch diameter, which are designed for high torsional strength.
2. Distributed support: Providing adequate support along the length of the torque tube (e.g., through multiple piers and hanger assemblies) to limit overall twist.
3. Drive system design: The drive itself could be designed to apply torque with minimal induced bending or localized twisting moments. The crank system described in Claim 3 could contribute to this by providing a balanced application of force.
4. Minimizing external twisting loads: While the system experiences loads from rotation and wind, the design aims to manage these to prevent excessive twisting.

A PHOSITA would be motivated to ensure the torque tube remains substantially free from twisting to maintain the precise alignment of the solar modules, which is critical for efficient solar tracking. Twisting would lead to misalignment of panels along the row, reducing energy capture and potentially damaging the structure. This is a fundamental design consideration in any long, rotating shaft system.

The combination of a well-supported, centrally-loaded torque tube via a suspension system (using a spherical bearing) and a drive designed to minimize twisting under load represents an obvious application of standard mechanical engineering principles to optimize the performance and longevity of a solar tracker.