Derivative works

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.

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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
    }

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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

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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

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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

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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.