US 9289688

A concise summary of US Patent 9,289,688, including its key details and a plain-language explanation of its independent claims, is provided below.

Summary of US Patent 9,289,688

Title: Games controller

Assignee: Ironburg Inventions Ltd.

Inventors: Simon Burgess, Duncan Ironmonger

Filing Date: August 21, 2015

Issue Date: March 22, 2016

Abstract:
An improved controller (10) for a games console that is intended to be held by a user in both hands in the same manner as a conventional controller (1). Additionally, the controller (10) may include the same controls (2, 3, 4, 5, 6, 7, 8, 9) as a conventional controller (1). The controller (10) is advantageous as it additionally comprises additional controls (11A, 11B, 11C, 11D) located on the rear of the controller (10) in a position to be operated by the middle fingers of a user (12). The additional controllers (11A, 11B, 11C, 11D) may be paddle levers and may replicate the functions of one or more of the controls (2, 3, 4, 5, 6, 7, 8, 9) located on the front or top of the controller (10).

Plain-Language Overview of Independent Claims

US Patent 9,289,688 has two independent claims which define the core of the invention.

Claim 1: This claim outlines a game controller with a standard layout of controls on the front and top surfaces for the user's thumbs and index fingers. The inventive aspect is the inclusion of at least one additional control located on the back of the controller. This extra control is designed as an elongated member, such as a paddle, positioned to be operated by the user's middle, ring, or little finger. A key feature of this additional control is that its inner surface (the one facing away from the user's finger) is intentionally not parallel to the outer surface of the controller's back where it is mounted.

Claim 30: This claim describes a control actuator designed to be added to a game controller. This actuator is an elongated member that can be mounted on the base of the controller in a position accessible to the user's middle, ring, or little finger. When displaced by the user, this actuator activates a control function. Similar to the first claim, the defining characteristic is that the surface of the actuator that is positioned next to the controller's outer surface is not parallel to that surface.

CAFC 2026 Docket Search

As of April 26, 2026, a search of the dockets for the U.S. Court of Appeals for the Federal Circuit (CAFC) for the year 2026 did not reveal any specific cases pertaining to US Patent 9,289,688. It is important to note that this patent has been the subject of significant litigation in previous years, notably in cases between Ironburg Inventions Ltd. and Valve Corporation.

Litigation History of US Patent 9,289,688

US Patent 9,289,688, assigned to Ironburg Inventions Ltd., has been the subject of multiple legal disputes, including district court litigation and extensive proceedings before the Patent Trial and Appeal Board (PTAB) and the Court of Appeals for the Federal Circuit (CAFC).

Ironburg Inventions Ltd. v. Valve Corporation

This dispute encompasses both district court infringement litigation and challenges to the patent's validity through Inter Partes Review (IPR).

District Court Litigation:

• Plaintiff: Ironburg Inventions Ltd.
• Defendant: Valve Corporation
• Jurisdiction: Initially filed in the U.S. District Court for the Northern District of Georgia, then transferred to the U.S. District Court for the Western District of Washington.
• Case Number: 1:15-cv-04219 (Northern District of Georgia)
• Filing Date: The complaint was amended on May 16, 2016, to include allegations of infringement of the '688 patent.
• Outcome/Status: This case was part of a broader dispute involving other Ironburg patents, including U.S. Patent No. 8,641,525. In a trial that largely focused on the '525 patent, a jury found Valve's infringement to be willful. The litigation has been marked by a complex interplay with the IPR proceedings, including disputes over estoppel, which have been appealed to the Federal Circuit.

Patent Trial and Appeal Board (PTAB) & Federal Circuit (CAFC) Appeals:

• Petitioner (Defendant): Valve Corporation
• Patent Owner (Plaintiff): Ironburg Inventions Ltd.
• Jurisdiction: Patent Trial and Appeal Board (PTAB), with subsequent appeals to the U.S. Court of Appeals for the Federal Circuit (CAFC).
• Case Numbers:
  • IPR2017-00858 (PTAB)
  • 20-1315 (CAFC Appeal)
  • 23-1725 (CAFC Appeal)
• Filing Date: Valve petitioned for IPR on February 7, 2017.
• Outcome/Status: The procedural history of this validity challenge is notably complex, involving multiple appeals and remands.
  • Initial PTAB Decision: The PTAB found several claims of the '688 patent unpatentable as anticipated by prior art, but determined other claims were not unpatentable.
  • First CAFC Appeal (Valve I): In a decision dated August 17, 2021, the Federal Circuit affirmed in part, reversed in part, vacated in part, and remanded the case back to the PTAB. The court, for instance, reversed the PTAB's finding that a key prior art reference ("Burns") was not prior art.
  • Remand and Second CAFC Appeal (Valve II): On remand, the PTAB again found certain dependent claims not unpatentable. Valve appealed this decision. On April 23, 2025, the Federal Circuit issued another opinion, criticizing the PTAB's approach on remand as inconsistent with its mandate and case law. The court vacated the Board's decision and remanded for a second time for further proceedings to determine the obviousness of the remaining dependent claims. The case is ongoing.

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Ironburg Inventions Ltd. v. Collective Minds Gaming Co. Ltd.

• Plaintiff: Ironburg Inventions Ltd.
• Defendant: Collective Minds Gaming Co. Ltd.
• Jurisdiction: U.S. District Court for the Northern District of Georgia
• Case Number: 1:2016cv04110
• Filing Date: 2016
• Outcome/Status: Court records indicate activity in this case as of June 15, 2018. Collective Minds also filed an IPR petition against the '688 patent (IPR2018-00357), which was terminated due to a settlement between the parties. The current status of the district court litigation is not publicly detailed in the available search results, but the settlement in the related IPR proceeding suggests a likely resolution of the district court case as well.

Proceedings overview

There are two AIA trial proceedings on file for US Patent 9,289,688, both being Inter Partes Reviews (IPRs). One IPR resulted in a partial invalidation of claims, with the outcome of certain remaining dependent claims still pending after multiple Federal Circuit remands. The other IPR was terminated due to settlement. This gives a defendant a mixed defensive posture: some claims have been canceled, making infringement theories built on them vulnerable, while others remain subject to ongoing validity challenges.

IPR2017-00858 — Valve Corporation v. Ironburg Inventions Ltd.

• Type: Inter Partes Review
• Filed: 2017-02-07
• Status: Claims 1, 2, 9, 10, 20, 22, 27, 28, and 30 were found unpatentable as anticipated by Uy. Claims 18, 19, 21, 26, and 29 were initially deemed not unpatentable by the PTAB, but this decision has been vacated and remanded by the Federal Circuit for further consideration of obviousness.
• Judge panel: Not publicly detailed in the search results for specific panel members, though Judge Dyk authored the CAFC opinion for the appeals.
• Petition grounds: Claims 1-3, 9, 10, 18-22, and 26-30 were challenged. The grounds included anticipation by U.S. Patent Application Publication No. 2015/0238855 ("Uy") and obviousness over the "Burns article" in combination with other references (e.g., LaCelle).
• Institution decision: The PTAB instituted review. The exact date and specific reasoning for institution on each ground are not detailed in the provided search results, beyond the claims challenged.
• Final Written Decision (if issued): The PTAB initially determined that claims 1, 2, 9, 10, 20, 22, 27, 28, and 30 were unpatentable as anticipated by Uy. The PTAB initially found dependent claims 18, 19, 21, 26, and 29 not unpatentable. The Board's reasoning for upholding the dependent claims was based on its conclusion that claim 1 was not shown to be unpatentable over Burns and LaCelle, a position later criticized by the Federal Circuit.
• Appeal: Yes, the Final Written Decision was appealed to the Federal Circuit twice.
  • First Appeal (Valve I): Docket No. 20-1315 (Fed. Cir. August 17, 2021). The Federal Circuit affirmed in part, reversed in part, vacated in part, and remanded the case. Crucially, the court reversed the PTAB's finding that the "Burns article" was not prior art, and affirmed the PTAB's determination that independent claim 1 was unpatentable as anticipated. The case was remanded for the Board to determine whether the dependent claims were obvious in light of Burns.
  • Second Appeal (Valve II): Docket No. 23-1725 (Fed. Cir. April 23, 2025). The Federal Circuit again vacated the Board's remand decision and remanded for a second time. The court found the PTAB's approach on remand inconsistent with its mandate in Valve I and issue preclusion, as the Board continued to consider claim 1 "at issue" despite its unpatentability being affirmed. The Federal Circuit instructed the PTAB to recognize claim 1 as unpatentable and then determine whether the dependent claims (18, 19, 21, 26, and 29) were patentably indistinct from claim 1, and to resolve factual disputes regarding motivation to combine Burns and LaCelle.
• Defensive value: Independent claim 1 is confirmed unpatentable, which significantly weakens any infringement theories solely reliant on it. Several other claims (2, 9, 10, 20, 22, 27, 28, 30) were also invalidated. The validity of dependent claims 18, 19, 21, 26, and 29 remains in flux, but the Federal Circuit's repeated remands indicate a strong challenge to their patentability.

IPR2018-00357 — Collective Minds Gaming Co. Ltd. v. Ironburg Inventions Ltd.

• Type: Inter Partes Review
• Filed: 2018-01-03
• Status: Settlement (terminated without a Final Written Decision).
• Judge panel: Not publicly available.
• Petition grounds: Not explicitly detailed in the provided search results, but it would have challenged specific claims of the '688 patent under § 102 and/or § 103 using various prior art.
• Institution decision: The decision on institution was entered on June 14, 2018.
• Final Written Decision (if issued): Not issued.
• Settlement / termination: The proceeding was terminated without a Final Written Decision pursuant to a joint request by the petitioner and patent owner. The parties informed the Board of their agreement to terminate in writing, and the motion was granted on November 8, 2018. The specific terms of the settlement are confidential.
• Appeal: No appeal was made to the Federal Circuit as the case was settled prior to a Final Written Decision.
• Defensive value: This IPR did not result in a final judgment on the merits of patentability, so it doesn't directly invalidate claims. However, the settlement suggests that Collective Minds Gaming Co. Ltd. reached an agreement with Ironburg, which may include licensing or other terms that could impact their ability to assert certain prior art in future disputes. Estoppel under 35 U.S.C. § 315(e)(2) applies to petitioners and their privies for grounds raised or reasonably could have raised, even in a settled IPR after institution.

Strategic summary

Claims 1, 2, 9, 10, 20, 22, 27, 28, and 30 of US Patent 9,289,688 have been CANCELED as anticipated by the Uy reference, a decision affirmed by the Federal Circuit. This significantly narrows the scope of the patent. Dependent claims 18, 19, 21, 26, and 29 are currently in a state of UNTESTED patentability, as the Federal Circuit has twice remanded their obviousness determination back to the PTAB. These claims were found not unpatentable by the PTAB in their first remand decision, but this finding was vacated due to the PTAB's erroneous approach in re-evaluating claim 1's obviousness. The Federal Circuit explicitly directed the PTAB to consider claim 1 unpatentable and re-evaluate the dependent claims' obviousness accordingly.

Regarding the estoppel landscape, Valve Corporation, as the petitioner in IPR2017-00858, and its privies are estopped from raising any ground that was raised or reasonably could have been raised in that IPR against claims 1-3, 9, 10, 18-22, and 26-30. This includes arguments of anticipation by Uy and obviousness in light of the "Burns article" in combination with other references. For a defendant currently being asserted against, this means that while claims 1, 2, 9, 10, 20, 22, 27, 28, and 30 are confirmed invalid, any new challenges to the surviving claims (18, 19, 21, 26, and 29) by Valve or its privies must rely on different prior art or different grounds. Collective Minds Gaming Co. Ltd. also settled an IPR (IPR2018-00357), which similarly triggers estoppel for claims challenged therein.

Ironburg Inventions Ltd. has aggressively pursued PTAB appeals, as evidenced by the multiple Federal Circuit appeals in IPR2017-00858, and has generally sought to defend the patent's validity. There is no indication of a defensive aggregator like Unified Patents in the chain of ownership.

Recommended next steps

If you are a defendant facing assertion of US Patent 9,289,688 today, you should immediately note that claims 1, 2, 9, 10, 20, 22, 27, 28, and 30 have been found unpatentable as anticipated by Uy. This finding was affirmed by the Federal Circuit, making these claims effectively canceled. Any infringement theory built on these specific claims is significantly weakened.

The validity of dependent claims 18, 19, 21, 26, and 29 is currently subject to a second remand to the PTAB. This means these claims are still under active challenge and their ultimate patentability is uncertain.

Refer to the Federal Circuit's opinion in Valve Corp. v. Ironburg Inventions Ltd., Case No. 23-1725, decided April 23, 2025, for the latest instructions to the PTAB regarding these dependent claims:
"We vacate and remand the Board's decision for further proceedings consistent with this opinion."
The court further stated that "the Board was required to recognize claim 1 as unpatentable and then determine whether the dependent claims were patentably indistinct from claim 1."
This indicates a strong possibility that some or all of the remaining dependent claims may also be found unpatentable upon further review by the PTAB.

Inventors

• Simon Burgess: Co-founder of Ironburg Inventions Ltd and the SCUF Gaming brand. At the time of filing, he was directly associated with the original assignee.
• Duncan Ironmonger: Co-founder and CEO of Ironburg Inventions Ltd and the SCUF Gaming brand. At the time of filing, he was directly associated with the original assignee.

There are no unusual patterns. The inventors assigned the patent to the company they founded, which is standard practice.

Original assignee

The original assignee is Ironburg Inventions Ltd., a UK-based company. Ironburg is the intellectual property holding company for SCUF Gaming, a well-known manufacturer of high-performance and customized "pro" gaming controllers. SCUF Gaming shipped numerous products, including its popular SCUF Infinity and SCUF Impact controllers, that directly embodied the claims of the '688 patent, particularly its use of rear-mounted paddle controls. In December 2019, SCUF Gaming (including its IP portfolio held by Ironburg) was acquired by the publicly-traded computer peripherals company Corsair. Ironburg Inventions Ltd. continues to operate as the IP holder and plaintiff in litigation.

Assignment timeline

• 2014-04-14 (executed) / recorded 2016-11-21 — Reel 040388/0870

  • Conveyance: Assignment
  • Assignor: Simon Burgess, Duncan Ironmonger
  • Assignee: Ironburg Inventions Ltd.
  • Correspondent: Not available in provided source text.
  • Context: Routine formal transfer of the invention from the individual inventors to their operating company to consolidate ownership.

• 2016-12-07 (executed) / recorded 2016-12-09 — Reel 040878/0527

  • Conveyance: Security Interest
  • Assignor: Ironburg Inventions Limited
  • Assignee: Triangle Capital Corporation
  • Correspondent: Not available in provided source text.
  • Context: Securitization of the patent, where the patent was used as collateral to secure financing for the business.

• 2016-12-07 (executed) / recorded 2016-12-12 — Reel 040884/0057

  • Conveyance: Security Interest
  • Assignor: Ironburg Inventions Limited
  • Assignee: Triangle Capital Corporation, As Agent
  • Correspondent: Not available in provided source text.
  • Context: A further recorded security interest related to the same financing arrangement with Triangle Capital Corporation.

• 2019-12-19 (executed) / recorded 2020-01-13 — Reel 051569/0397

  • Conveyance: Release by Secured Party
  • Assignor: BSP Agency LLC
  • Assignee: Ironburg Inventions Limited
  • Correspondent: Not available in provided source text.
  • Context: Release of the previously recorded security interests, returning full and unencumbered title to Ironburg Inventions Ltd, likely following the satisfaction of the financing terms or in connection with the company's acquisition by Corsair.

Timeline diagram

timeline
    title Ownership of US 9289688
    2014 : Executed assignment from inventors
    2015 : Application filed
    2016 : Patent issued
         : Assignment from inventors recorded
         : Security interest to Triangle Capital
         : First infringement suit filed
    2020 : Security interest released

NPE / troll-pattern signals

1. Shell-entity transfer: Not present. The patent has remained with the original entity, Ironburg Inventions Ltd., which is the IP holding company for an active operating business (SCUF Gaming) that commercialized the invention.

2. Known asserter in the chain: Present. Ironburg Inventions Ltd. is a known and frequent plaintiff, having asserted this patent and others in its portfolio against major industry players like Valve Corporation and Collective Minds Gaming. This activity is well-documented in court records (1:15-cv-04219, 1:2016cv04110).

3. Repeat correspondent across the chain: Unclear. The correspondent information for the assignment recordings is not available in the provided source text.

4. Cascading transfers: Not present. The recorded assignments are limited to the initial inventor transfer and a multi-year security interest agreement, not a rapid series of transfers between different LLCs.

5. Pre-litigation transfer: Not present. The patent was asserted by its original assignee. The 2016 recording of the 2014 inventor assignment was a standard action to perfect title before filing suit, not a transfer to a third-party assertion entity.

6. Bankruptcy fire-sale: Not present. There is no evidence of bankruptcy.

7. Privateering: Not present. Ironburg Inventions Ltd. has asserted the patent directly on its own behalf.

8. Defensive aggregator (anti-NPE): Not present. The patent has not been transferred to a defensive entity.

Verdict

Operating-company assertion

This verdict is based on clear evidence that the current patent owner, Ironburg Inventions Ltd., is the corporate entity tied to the original inventors and the SCUF Gaming brand, which has manufactured and sold products embodying the patent's claims for years. The company's extensive litigation history (e.g., against Valve) represents direct enforcement of its intellectual property against competitors in the marketplace. While a frequent asserter, Ironburg is a practicing entity, not a non-practicing entity (NPE).

Verification of the assignment history can be performed at the USPTO Patent Assignment Search page by searching for patent number 9289688.

Based on the prosecution history of US patent 9,289,688, the following prior art references are identified as most relevant. The analysis focuses on the potential for each reference to anticipate claims of the '688 patent under 35 U.S.C. § 102, which requires a single prior art reference to disclose every element of a claim.

Analysis of Cited Prior Art

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GB2481633A

• Full Citation: GB2481633A, "Games console controller with buttons on underside," published January 4, 2012, assigned to Simon David Burgess (one of the inventors of the '688 patent).
• Brief Description: This British patent application describes a game controller modified to include additional buttons on its underside, specifically on the inner faces of the grip portions. These buttons are positioned to be operated by the user's middle fingers. The application's goal is to allow users to perform actions without removing their thumbs from the analog sticks, a core problem also addressed by the '688 patent. The actuators are described as "paddles" which are elongate and can be retrofitted to an existing controller.
• Potential Anticipation: This reference is highly relevant as it discloses the core concept of adding controls to the back of a controller for operation by the middle, ring, or little fingers.
  • Claim 1: The '633 application discloses a controller case, standard top/front controls, and additional controls on the back ("underside") in the form of "elongate" paddles operable by a user's middle fingers. It therefore teaches most elements of claim 1. However, the '633 application does not appear to explicitly teach or suggest the key limitation of claim 1: that the second (outer) surface of the elongate member is "non-parallel with a portion of the outer surface of the back of the case to which the first elongate member is mounted." The paddles in the figures of GB'633 appear to be substantially flat and mounted parallel to the surface. Therefore, it is unlikely to anticipate claim 1.
  • Dependent Claims: Because it does not appear to anticipate the independent claim 1, it would not anticipate the dependent claims which add further limitations.

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US20120322553A1

• Full Citation: US20120322553A1, "Controller for video game console," published December 20, 2012, assigned to Ironburg Inventions Ltd.
• Brief Description: This application, from the same assignee, describes a controller with additional actuators on the rear surface, positioned to be operated by the user's middle, ring, or little fingers. The actuators are depicted as paddle levers that can be removably attached to the controller body. The design allows a user to actuate functions without removing their thumbs from the thumbsticks. The paddles are described as being flexible and resilient.
• Potential Anticipation: This reference builds on the concepts in GB'633 and is very close to the '688 patent's claims.
  • Claim 1: The '553 application clearly discloses a controller with rear-mounted, elongate paddle levers operable by the middle/ring/little fingers. The central question for anticipation is again the "non-parallel" surface limitation. The figures in the '553 application generally show flat paddles mounted flush within channels on the controller's back surface. It does not appear to describe or illustrate an arrangement where the outer, user-facing surface of the paddle is intentionally non-parallel to the controller surface it is mounted on. Thus, it does not seem to anticipate claim 1.
  • Claim 4: The '553 application discloses configurations with multiple paddles per side. However, it does not describe the specific geometry where an outer paddle's surface is shaped to "direct the user's finger towards the second elongate member disposed adjacent thereto."
  • Other Claims: Without anticipating claim 1, this reference is unlikely to anticipate the other claims.

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US20150238855A1

• Full Citation: US20150238855A1, "Game controller," published August 27, 2015 (priority date September 26, 2012), assigned to Razer (Asia-Pacific) Pte. Ltd.
• Brief Description: This application, cited by the patent examiner, discloses a game controller with additional multi-function triggers on the underside of the controller body. These triggers are positioned between the two hand grips and are intended to be operated by the user's middle or ring fingers. The triggers are shown as elongate levers that pivot to activate a switch.
• Potential Anticipation:
  • Claim 1: The Razer application discloses the placement of additional, elongate controls on the back of the controller for operation by the fingers not used for the top/front controls. However, similar to the Ironburg prior art, the triggers shown in the figures appear to have surfaces that are largely parallel to the controller casing. The focus is on the pivoting mechanical action rather than a specific non-parallel surface geometry for ergonomic purposes. Therefore, it does not appear to anticipate the specific geometric limitation of claim 1.
  • Claim 26: The controls are described as "triggers" but function as paddle levers, potentially reading on this claim's language. However, this is dependent on the anticipation of claim 1.

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US7510477B2

• Full Citation: US7510477B2, "Control apparatus for use with a computer or video game system," published March 31, 2009, assigned to Eric J. Argentar.
• Brief Description: This patent describes a game controller with a primary and secondary gripping position. In the secondary position, the controller is rotated, and the user's fingers can access button actuators located on what would normally be the back/bottom surface of the controller handles.
• Potential Anticipation:
  • Claim 1: The Argentar patent discloses controls on the rear surface of the controller. However, these are described as "button actuators" rather than "elongate members." Furthermore, the design does not appear to contemplate or disclose the non-parallel surface geometry that is the key limitation of claim 1 of the '688 patent. The primary inventive concept in Argentar is the dual-grip configuration, not the specific ergonomics and shape of the rear controls. Therefore, it does not anticipate claim 1.

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EP2479636A2

• Full Citation: EP2479636A2, "Portable electronic device with rear touch panel," published July 25, 2012, assigned to Sony Computer Entertainment Inc.
• Brief Description: This European application describes a handheld gaming device (similar to a PlayStation Vita) that features a touch-sensitive panel on the rear surface of the device. This allows for user input using the fingers that are naturally positioned on the back of the device while holding it.
• Potential Anticipation:
  • Claim 1: This reference fails to anticipate claim 1 for a fundamental reason: it discloses a touch panel, not a mechanically "displaceable" "elongate member" that activates a control function. The claims of the '688 patent are directed to a physical, movable actuator (a paddle lever), which is distinct from a capacitive or resistive touch surface. Therefore, this reference does not anticipate claim 1 or any of its dependent claims.

Obviousness Analysis of US Patent 9,289,688

An analysis of the prior art cited in US Patent 9,289,688 ("the '688 patent") suggests that its claims would have been obvious to a Person Having Ordinary Skill in the Art (PHOSITA) at the time of the invention. The primary inventive concept of the '688 patent is a game controller featuring at least one additional, elongate control on its back, positioned for operation by the user's middle, ring, or little finger, where the control's inner surface is non-parallel to the controller body. This concept appears to be a combination of previously known elements to solve a recognized problem in the art.

The following combinations of prior art render the independent claims of the '688 patent obvious under 35 U.S.C. § 103.

Combination 1: GB2481633A (Burgess) in view of Ergonomic Design Principles

A strong argument for obviousness can be made using a single primary reference, GB2481633A to Simon David Burgess ("Burgess"), which was published on January 4, 2012. This reference is particularly relevant as Mr. Burgess is also a named inventor on the '688 patent.

• Base Reference: GB2481633A (Burgess)
  Burgess discloses the core novelty of the '688 patent: a games controller with additional buttons on its underside, specifically positioned to be operated by the user's middle fingers. The abstract of Burgess states, "A games console controller (1) comprises additional buttons (3,4) on the underside of the controller, in a position to be operated by the middle fingers of a user." This directly teaches the fundamental concept of relocating controls to the rear of the controller to free up the user's thumbs, which is the same problem the '688 patent purports to solve. Burgess, therefore, discloses the majority of the limitations in claim 1 of the '688 patent, including:

  • A games controller case with standard controls on the front and top.
  • The controller is shaped to be held by two hands with thumbs on top and index fingers on the front.
  • At least one additional control is located on the back/underside of the case.
  • This control is positioned to be operable by a middle, ring, or little finger.

• Missing Elements and Motivation to Modify
  The primary elements from claim 1 of the '688 patent not explicitly detailed in the figures of Burgess are the "elongate member" shape and the specific geometric limitation that the "second surface" of this member is "non-parallel" to the controller body.

  However, modifying the simple button actuators shown in Burgess into elongate, paddle-like members with non-parallel surfaces would have been an obvious design choice for a PHOSITA focused on improving ergonomics and usability.

  • Motivation: A PHOSITA would have been motivated to modify the basic button design in Burgess to accommodate different hand sizes and finger positions, a well-known challenge in controller design. Making the actuator an "elongate member" (i.e., a paddle) rather than a simple round button provides a larger surface area for activation, making it easier for users with different hand sizes or grip styles to use the control comfortably and without repositioning their hands. This is a predictable improvement.
  • Non-Parallel Surface: The limitation requiring the actuator's second surface to be non-parallel to the controller body is a direct result of applying basic ergonomic principles. Angling the surface of a control relative to its mounting point is a common technique to make it easier to actuate, provide better tactile feedback, and guide a user's finger. A PHOSITA would have found it obvious to cant or angle the underside of the elongate paddle to better align with the natural arcing motion of a user's finger as it squeezes or presses the control. This modification would make the control more comfortable and responsive, a clear and predictable benefit.

Therefore, the combination of the rear-button concept from Burgess with routine ergonomic and industrial design principles would have yielded the invention claimed in the '688 patent.

Combination 2: EP2479636A2 (Sony) in view of US20120322553A1 (Ironburg)

An alternative argument for obviousness can be made by combining a reference that teaches rear-mounted controls on a handheld device with a reference that teaches mechanical paddle-style actuators.

• Base Reference: EP2479636A2 to Sony Computer Entertainment Inc. ("Sony")
  Published on July 25, 2012, Sony discloses a "portable electronic device," such as a gaming device, that features a "rear touch panel." This explicitly teaches the concept of user input controls on the back of a handheld device, intended to be operated by the fingers that are gripping the device. This provides a foundation for a controller with rear-input capabilities.

• Secondary Reference: US20120322553A1 to Ironburg Inventions Ltd. ("Ironburg '553")
  Published on December 20, 2012, this application (from the same assignee as the '688 patent) discloses a controller with removable and repositionable paddle levers on the rear of the controller. These paddles are explicitly described as elongate actuators.

• Motivation to Combine: A PHOSITA would have been motivated to combine the teachings of Sony and Ironburg '553 for a clear reason: to improve performance and user experience. While Sony's rear touch panel allows for rear input, touch panels are widely recognized as lacking the tactile feedback of physical, mechanical buttons. For many games, particularly fast-paced action or shooting games, the distinct click and travel of a mechanical switch is superior to a flat touch surface.

  A PHOSITA, seeing the rear input area taught by Sony, would be motivated to replace the non-tactile touch panel with the mechanical, elongate paddle actuators taught by Ironburg '553 to provide gamers with improved tactile response. This combination would predictably result in a controller with elongate mechanical members on the back for rear-finger input. Adding an ergonomic, non-parallel angle to the surface of these paddles, as discussed previously, would be a further obvious step to enhance comfort and ease of use. This combination directly arrives at the subject matter of claim 1 of the '688 patent.

Analysis of Patent Term, Adjustments, and Family for US Patent 9,289,688

Date of Analysis: May 9, 2026

This analysis details the term adjustments, related applications, and patent family of US Patent 9,289,688, titled "Games controller."

Patent Term and Expiration

• Filing Date: August 21, 2015
• Priority Date: The application claims priority from a provisional application filed on April 14, 2014. For the purpose of calculating the 20-year patent term, the non-provisional filing date is the critical date.
• Issue Date: March 22, 2016

Based on a standard 20-year term from the non-provisional filing date, the patent is projected to expire on August 21, 2035.

Patent Term Adjustments (PTA) and Extensions (PTE)

• Patent Term Adjustment (PTA): A review of the prosecution history for this patent indicates that no Patent Term Adjustment (PTA) was granted. The USPTO's calculation at the time of issuance determined that there were no qualifying administrative delays during the examination process that would warrant an extension of the patent's term under 35 U.S.C. § 154(b).

• Patent Term Extension (PTE): There is no indication of a Patent Term Extension (PTE) for this patent. PTE under 35 U.S.C. § 156 is typically granted for delays related to regulatory review by agencies like the Food and Drug Administration (FDA) for products such as drugs or medical devices. As a patent for a games controller, this invention does not fall into the categories eligible for such an extension.

Continuity and Related Applications

US Patent 9,289,688 is a continuation of an international patent application.

• Parent Application: The patent is a continuation of International Application No. PCT/EP2015/058096, which was filed on April 14, 2015. This international application, in turn, claims priority from U.S. Provisional Application No. 61/979,124, filed on April 14, 2014.

• Continuation or Divisional Applications: A search of USPTO records shows no continuation or divisional applications have been filed that claim priority to US Patent 9,289,688 or its direct application number (14/832,211). The patent itself is the final grant in this particular line of prosecution in the United States.

Patent Family Members

US Patent 9,289,688 is part of a larger international patent family, indicating that the assignee, Ironburg Inventions Ltd., sought protection for this invention in multiple jurisdictions. Key family members include:

• International (WIPO): WO2015158727A1
• European Patent Office (EPO): EP3131649B1
• China (CNIPA): CN106457040B
• Japan (JPO): JP2017511240A

The existence of these counterparts in major international markets underscores the commercial importance of the invention to the assignee.

Defensive Disclosure and Prior Art Generation for US Patent 9,289,688

Publication Date: May 9, 2026
Subject: Derivative designs and applications of rear-mounted, non-parallel game controller actuators.
Purpose: This document enters the public domain to serve as prior art for future patent applications, rendering obvious or non-novel any incremental variations of the technologies described herein, which are derived from the core concepts disclosed in US Patent 9,289,688.

---

Axis 1: Material & Component Substitution

Derivative 1.1: Shape-Memory Alloy (SMA) Haptic Paddle

• Enabling Description: The elongate member (paddle) is fabricated from a Nickel-Titanium (Nitinol) shape-memory alloy, replacing the conventional resilient polymer. The paddle's resting state geometry incorporates the non-parallel surface relative to the controller's mounting point, as defined by its pre-set Austenite phase. A micro-controller manages a low-voltage current passed through the Nitinol paddle via embedded contacts. When activated, this current induces a phase change to Martensite, altering the paddle's stiffness or causing a subtle deflection. This allows for dynamic, software-controlled haptic feedback, such as stiffening the paddle to simulate trigger resistance or creating a "pulse" sensation. Actuation of a control function is registered by a standard microswitch or a strain gauge that detects the user's mechanical displacement of the SMA.

graph TD
    subgraph Controller
        A[Microcontroller]
    end

    subgraph SMA_Paddle_Assembly
        B(Nitinol Elongate Member <br> Non-Parallel Surface)
        C{Strain Gauge /<br> Microswitch}
        D[Heating/Cooling Element]
    end

    A --Control Signal (Voltage)--> D
    D --Phase Change--> B
    User --Mechanical Force--> B
    B --Deflection--> C
    C --Input Signal--> A
    A --Haptic Data--> D

    style B fill:#f9f,stroke:#333,stroke-width:2px

Derivative 1.2: Piezoresistive Polymer Analog Paddle

• Enabling Description: The paddle is molded from a carbon-nanotube-infused piezoresistive polymer composite. The elongate member retains the non-parallel surface geometry for ergonomic finger placement. Two conductive traces are printed on the interior-facing surface of the paddle, running its length. As the user applies pressure and flexes the paddle, the resistance of the polymer between the traces changes proportionally to the degree of mechanical strain. An analog-to-digital converter (ADC) reads this resistance value, providing a continuous data stream (e.g., 0-1023) instead of a binary on/off signal. This enables pressure-sensitive control, where a light touch could be mapped to walking and a full press to running.

sequenceDiagram
    participant User
    participant PiezoresistivePaddle
    participant ADC
    participant GameLogic

    User->>PiezoresistivePaddle: Apply varying pressure
    PiezoresistivePaddle->>PiezoresistivePaddle: Flex and change resistance
    loop Real-time Sensing
        ADC->>PiezoresistivePaddle: Read resistance value
        PiezoresistivePaddle-->>ADC: Return analog signal
        ADC->>GameLogic: Send digitized value (e.g., 8-bit)
    end
    GameLogic->>GameLogic: Map value to analog action (e.g., throttle)

Derivative 1.3: Modular Hall Effect Sensor Paddle with Magnetic Coupling

• Enabling Description: This derivative decouples the paddle from the controller body using a magnetic attachment mechanism. The controller case features a recessed socket containing a Hall effect sensor and a circular array of high-strength neodymium magnets. The base of the paddle, which features the non-parallel user-facing surface, contains a corresponding set of magnets and a small actuating magnet positioned over the sensor. This allows for tool-less swapping of paddles with different shapes, textures, and non-parallel angles. User displacement of the paddle moves the actuating magnet closer to the Hall effect sensor, which triggers a digital high signal. This design eliminates mechanical switches for improved durability and allows for user customization.

classDiagram
    class ControllerBody {
        +recessedSocket
        +hallEffectSensor
        +neodymiumMagnetArray
        +processInput()
    }
    class ModularPaddle {
        +nonParallelSurface
        +actuatingMagnet
        +couplingMagnetArray
        +attachTo(ControllerBody)
    }
    ControllerBody "1" -- "1..*" ModularPaddle : magnetically couples to

---

Axis 2: Operational Parameter Expansion

Derivative 2.1: MEMS Capacitive Micro-Actuator

• Enabling Description: The entire actuator is scaled down to a micro-electromechanical system (MEMS) device for use in ultra-small electronics (e.g., smart rings, AR glasses). The elongate member is a silicon cantilever beam, typically under 1mm in length, fabricated using deep reactive-ion etching. The "non-parallel" surface is achieved by a secondary angled etch or by depositing a shaped polymer layer. This cantilever acts as one plate of a variable capacitor, with a fixed plate positioned beneath it on the substrate. Finger pressure deflects the cantilever, changing the capacitance between the plates. A capacitance-to-digital converter IC measures this change to register input, providing high-sensitivity, low-power actuation.

graph LR
    A[Finger Pressure] --> B(MEMS Cantilever <br> w/ Angled Surface);
    B --> C{Capacitance Change};
    C --> D[Capacitance-to-Digital Converter];
    D --> E[Device Logic];

    style B fill:#cde,stroke:#333,stroke-width:2px

Derivative 2.2: IP67-Rated Industrial Control Lever

• Enabling Description: The concept is scaled up for industrial control grips used in heavy machinery (cranes, excavators, forestry equipment). The elongate member is a drop-forged A36 steel or cast aluminum lever, over-molded with a high-durometer thermoplastic elastomer (TPE) for grip. The non-parallel surface is ergonomically sculpted for a large, gloved hand, providing tactile differentiation from adjacent controls. The lever pivots on a sealed, greased bushing and actuates a non-contact, fully potted inductive proximity sensor rated for IP67 water/dust ingress protection. The entire assembly is designed to operate within a temperature range of -40°C to +85°C and withstand shock and vibration levels specified by ISO 13766.

stateDiagram-v2
    [*] --> Idle
    Idle --> Depressed: User applies force > 5N
    Depressed --> Idle: User releases force
    Depressed: Inductive Sensor State: HIGH
    Idle: Inductive Sensor State: LOW

    state Depressed {
        note right of Depressed
            High vibration &
            -40°C to +85°C
            environment
        end note
    }

---

Axis 3: Cross-Domain Application

Derivative 3.1: Aerospace HOTAS Secondary Control

• Enabling Description: Within a Hands-On-Throttle-And-Stick (HOTAS) grip for a military or commercial aircraft, a set of four rear-mounted paddles with non-parallel surfaces are integrated. They are fabricated from carbon fiber composite for high strength-to-weight ratio. Each paddle corresponds to a non-critical-flight function such as radio PTT (Push-To-Talk), target designation, or chaff/flare deployment. The non-parallel geometry allows the pilot to differentiate and actuate controls using their middle and ring fingers without altering their grip on the primary flight stick, which is critical during high-G maneuvers or in turbulent conditions. The switches are MIL-SPEC grade with redundant contacts.

graph TD
    subgraph HOTAS_Grip
        P(Primary Flight Stick)
        T(Thumb Controls)
        I(Index Finger Trigger)
        RP1[Rear Paddle 1 - Radio]
        RP2[Rear Paddle 2 - Target]
        RP3[Rear Paddle 3 - Chaff]
        RP4[Rear Paddle 4 - Flare]
    end
    PilotHand -- Grips --> P
    PilotHand -- Operates --> T
    PilotHand -- Operates --> I
    PilotHand -- Operates --> RP1
    PilotHand -- Operates --> RP2
    PilotHand -- Operates --> RP3
    PilotHand -- Operates --> RP4

    style RP1 fill:#bbf,stroke:#333,stroke-width:2px
    style RP2 fill:#bbf,stroke:#333,stroke-width:2px
    style RP3 fill:#bbf,stroke:#333,stroke-width:2px
    style RP4 fill:#bbf,stroke:#333,stroke-width:2px

Derivative 3.2: Agricultural Drone Payload Controller

• Enabling Description: A controller for an agricultural drone used for crop spraying or seeding incorporates two large, robust paddles on the rear. The paddles are made from glass-filled nylon for chemical resistance. The non-parallel surfaces are exaggerated to provide clear tactile feedback for operators wearing work gloves. The left paddle controls payload deployment (e.g., opens a spray nozzle valve), while the right paddle cycles through camera/sensor feeds (e.g., visual vs. NDVI). This allows the operator to maintain continuous thumb control over the drone's flight path (pitch, roll, yaw, throttle) while managing the mission payload.

sequenceDiagram
    participant Operator
    participant DroneController
    participant Drone

    Operator->>DroneController: Manipulate thumbsticks for flight
    DroneController->>Drone: Send flight commands
    Operator->>DroneController: Squeeze left rear paddle
    DroneController->>Drone: Send command: "OPEN_SPRAY_NOZZLE"
    Operator->>DroneController: Tap right rear paddle
    DroneController->>Drone: Send command: "CYCLE_CAMERA_FEED"

Derivative 3.3: Laparoscopic Surgical Instrument Actuator

• Enabling Description: The handle of a laparoscopic surgical device (e.g., grasper, shears) is equipped with a miniaturized, sterile paddle actuator. The paddle is 3D printed from a biocompatible, autoclavable polymer like PEEK or Ultem. The non-parallel surface is positioned for middle-finger actuation. Displacing the paddle controls an auxiliary function of the instrument's end effector, such as activating an electrocautery current to coagulate tissue, or triggering a saline irrigation jet. This frees the surgeon's thumb and index finger to focus exclusively on the primary manipulation (grasping, cutting) of the instrument, enhancing precision and reducing hand fatigue.

graph LR
    subgraph Surgeon_Hand
        Thumb_Index[Thumb & Index Fingers]
        Middle[Middle Finger]
    end
    subgraph Instrument_Handle
        A[Primary Manipulator]
        B(Rear Paddle <br> Non-Parallel)
    end
    subgraph End_Effector
        C[Grasper/Shears]
        D[Electrocautery/Irrigation]
    end

    Thumb_Index --> A --> C
    Middle --> B --> D

---

Axis 4: Integration with Emerging Tech

Derivative 4.1: AI-Driven Contextual Haptic Paddle

• Enabling Description: The paddle is integrated with an onboard neural processing unit (NPU) and a wide-band linear resonant actuator (LRA). An AI model, trained on gameplay data and user biometrics (from other sensors), predicts the desired haptic response for a given in-game event. When the user actuates the paddle to fire a weapon, the AI instructs the LRA to generate a sharp, high-frequency "crack" effect. When used to jump, it generates a low-frequency "thump." An IoT accelerometer monitors user grip and motion, feeding this data to the AI to adjust the haptic profile in real-time, preventing undesirable vibrations during fast controller movements.

graph TD
    A[Game Event] --> B{AI Model on NPU};
    C[User Biometrics/Motion] --> B;
    B --Predicted Haptic Profile--> D[LRA Driver];
    D --> E(LRA in Paddle);
    F[User Finger] --> G(Paddle Actuation);
    G --> A;
    E --Vibration--> F;

Derivative 4.2: IoT-Enabled Biometric Monitoring Paddle

• Enabling Description: The non-parallel surface of the paddle, where the user's finger rests, is embedded with dry-contact electrodes for galvanic skin response (GSR) and a miniaturized PPG (photoplethysmography) sensor for heart rate monitoring. These IoT sensors continuously stream biometric data via Bluetooth Low Energy to a connected application. This data can be used to track player stress and excitement levels during esports competitions, providing analytics for performance coaching. The data can also be used by the game itself to dynamically adjust difficulty, for example, by simplifying a task if the player's stress level exceeds a critical threshold.

erDiagram
    PLAYER ||--o{ PADDLE_CONTACT : rests_finger_on
    PADDLE_CONTACT {
        string electrode_type "GSR"
        string sensor_type "PPG"
    }
    PADDLE_CONTACT ||--|{ BIOMETRIC_DATA : generates
    BIOMETRIC_DATA {
        float gsr_value
        int heart_rate_bpm
        datetime timestamp
    }
    BIOMETRIC_DATA }o--|| GAME_ANALYTICS_ENGINE : streams_to

Derivative 4.3: Blockchain-Verified Ergonomic Profile

• Enabling Description: A process is defined for creating custom-fit controller paddles for professional esports players. The player's hand is 3D scanned, and a unique paddle with a non-parallel surface optimized for their specific finger length and grip style is designed in CAD software. The final CAD file's SHA-256 hash is embedded in the metadata of a non-fungible token (NFT) minted on a public blockchain (e.g., Ethereum). This NFT serves as an immutable certificate of authenticity. Tournament officials can verify the physical paddle by 3D scanning it and comparing its hash to the one on the blockchain, ensuring no unapproved modifications have been made.

sequenceDiagram
    participant Player
    participant Designer
    participant Blockchain
    participant TournamentAdmin

    Player->>Designer: 3D Scan Hand
    Designer->>Designer: Create custom CAD file for paddle
    Designer->>Blockchain: Hash CAD file & Mint NFT with hash
    Blockchain-->>Player: Assign NFT ownership
    Player->>TournamentAdmin: Present paddle for inspection
    TournamentAdmin->>TournamentAdmin: 3D Scan physical paddle
    TournamentAdmin->>Blockchain: Query player's NFT for original hash
    alt Scanned Hash == Blockchain Hash
        TournamentAdmin-->>Player: Approve Hardware
    else Scanned Hash != Blockchain Hash
        TournamentAdmin-->>Player: Disqualify Hardware
    end

---

Axis 5: The "Inverse" or Failure Mode

Derivative 5.1: Sacrificial Shear-Point Paddle

• Enabling Description: The paddle is designed with a planned failure point. It is molded as two parts: a durable main paddle body and a small, replaceable base that attaches to the controller. The interface between these two parts is a thin, notched cross-section—a mechanical fuse. Under normal operation, it is rigid. If a force exceeding a specified threshold (e.g., 50N) is applied, as in a drop or impact, the notched section is designed to fracture cleanly. This isolates the force, protecting the more expensive controller housing and internal switch from damage. The user can then discard the broken base and snap on a low-cost replacement.

stateDiagram-v2
    state "Intact" as A
    state "Broken" as B

    [*] --> A
    A --> B: Force > 50N
    B --> A: Replace Mechanical Fuse

    state A {
        description Normal Operation
    }
    state B {
        description Paddle detached, internal components protected
    }

Derivative 5.2: Dual-Mode Electro-Mechanical Paddle

• Enabling Description: The paddle system features two distinct actuation modes. The primary mode uses a low-travel optical sensor for fast, precise, and wear-free input. This mode is active when the controller has sufficient battery power. If the controller enters a low-power state, it disables the optical sensor to conserve energy. The paddle's physical travel, however, is designed to extend slightly beyond the optical sensor's trigger point. In this extended travel range, a secondary, high-actuation-force mechanical snap-dome switch is positioned. In low-power mode, the user simply presses the paddle harder to activate the mechanical switch, providing a "limp-home" capability that ensures essential game functions remain available.

graph TD
    A[User Presses Paddle] --> B{Travel Distance};
    B -- < 2mm --> C[Optical Sensor];
    B -- > 2mm --> D[Mechanical Switch];

    subgraph High Power Mode
        C --Input--> E[System Logic];
    end
    subgraph Low Power Mode
        C -- Disabled --> X(No Output);
        D --Input--> E;
    end

---

Combination Prior Art Scenarios with Open-Source Standards

1. Combination with Arduino and USB HID Protocol: A complete DIY guide is published on an open-source platform (e.g., Instructables, GitHub). The guide provides 3D printable STL files for a modular paddle assembly with the non-parallel geometry of US 9,289,688, a circuit diagram using a standard tactile microswitch, and source code for an Arduino Pro Micro. The code implements the open USB HID (Human Interface Device) standard, causing the paddle to be recognized by any modern PC or console (with adapter) as a standard joystick button. This fully discloses the implementation of the core invention using commonly available, open-standard components and protocols.

2. Combination with Godot Engine Input API: An open-source plugin is released for the Godot game engine. The plugin creates a new input event type, InputEventPaddle, specifically for rear-mounted actuators. The plugin's documentation and example projects explicitly detail how to map this event to game actions that benefit from the ergonomic advantages of the non-parallel paddle design (e.g., "slide," "dodge," "quick-melee"). This document discloses the combination of the specific hardware configuration with a widely used open-source game development platform, establishing prior art for software-level integrations.

3. Combination with WebHID API: A JavaScript library and public web demonstration are created to showcase the use of a controller featuring the non-parallel paddles directly in a web browser. The library uses the open WebHID API standard to connect to the controller. The demo application allows users to manipulate a 3D object in a WebGL scene or control video playback using the rear paddles. This publication discloses the application of the patented hardware design outside the traditional console/PC gaming environment, using open web standards for universal accessibility and control.