Derivative works — US Patent 10598101

Defensive Disclosure for U.S. Patent No. 10,598,101

Publication Date: May 14, 2026
Reference ID: DPD-10598101-A
Title: Derivative Embodiments and Cross-Domain Applications of Mechanically Interlocked Multi-Fuel Selector Assemblies

This document discloses novel variations, applications, and integrations of the core mechanism described in U.S. Patent No. 10,598,101. The intent is to place these concepts into the public domain to serve as prior art against future patent applications claiming these or obvious variants thereof. The disclosures herein are described to a level of detail sufficient for a person skilled in the art to practice the invention without undue experimentation.

Derivatives of Independent Claim 1: Manual Selector for Dual Mechanical Valves

Claim 1 Core Concept: A manually operated selector switch on a valve assembly with two distinct mechanical valves to control flow from two fuel sources.

1. Material & Component Substitution

Derivative 1.1: Ceramic Rotary Valves
- Enabling Description: The first and second mechanical fuel valves are constructed as rotary shear valves using alumina ceramic (Al2O3) discs. The selector switch is mechanically linked to rotate these discs. One disc has inlet and outlet ports corresponding to the fuel lines. A second, spring-loaded disc rotates against the first. The rotation aligns or misaligns channels in the discs to open or close the fuel path. This provides superior wear resistance to abrasive particles in fuels and resilience to corrosive fuel additives like ethanol. The valve body is a carbon-fiber-reinforced PEEK (Polyether ether ketone) polymer for high strength and chemical inertness.
- ```
graph TD
    A[Fuel Source 1] --> V1{Ceramic Valve 1};
    B[Fuel Source 2] --> V2{Ceramic Valve 2};
    S[Selector Switch] --Mechanical Link--> V1;
    S --Mechanical Link--> V2;
    V1 --> E[Engine];
    V2 --> E;
    subgraph Valve Assembly
        V1;
        V2;
    end
```
Derivative 1.2: Shape-Memory Alloy (SMA) Actuators
- Enabling Description: The selector switch does not directly move the valve handles. Instead, it completes one of two low-voltage electrical circuits. Each circuit connects to a Nitinol (Nickel-Titanium alloy) wire actuator. When energized, the Nitinol wire heats, contracts, and pulls a lever to open its corresponding fuel valve (a standard ball valve). A bias spring closes the valve when the circuit is opened. The selector switch is a "break-before-make" design, ensuring that one circuit is de-energized before the other is energized, preventing simultaneous valve opening.
- ```
sequenceDiagram
    participant User
    participant SelectorSwitch
    participant SMA_Actuator1
    participant FuelValve1
    participant SMA_Actuator2
    participant FuelValve2

    User->>SelectorSwitch: Select Fuel 1
    SelectorSwitch->>SMA_Actuator1: Apply low voltage
    SMA_Actuator1->>FuelValve1: Contract and pull lever (Open)
    SelectorSwitch->>SMA_Actuator2: De-energize circuit
    SMA_Actuator2->>FuelValve2: Bias spring closes valve (Closed)
```

2. Operational Parameter Expansion

Derivative 1.3: Cryogenic Dual-Fuel Selection
- Enabling Description: The invention is scaled for cryogenic applications, specifically for a rocket engine selecting between liquid methane (LCH4) and liquid hydrogen (LH2). The valve assembly is constructed from Inconel 718 alloy to withstand temperatures down to -253°C. The mechanical valves are cryogenic-rated ball valves with extended bonnets to keep the manual selector switch handle at a safe operating temperature. The sealing elements are spring-energized PTFE seals. The selector switch has a high-torque gearbox to overcome potential ice formation and increased fluid viscosity at low temperatures.
- ```
flowchart LR
    subgraph Cryogenic Fuel System
        F1[LH2 Tank] --Insulated Line--> V1(Cryo Valve 1);
        F2[LCH4 Tank] --Insulated Line--> V2(Cryo Valve 2);
    end
    S[High-Torque Selector] ==> V1;
    S ==> V2;
    V1 --> E((Engine Combustion Chamber));
    V2 --> E;
```
Derivative 1.4: Microfluidic Gas Selection
- Enabling Description: The entire assembly is miniaturized onto a silicon-glass microfluidic chip for a gas chromatograph. The "fuel sources" are two different carrier gases (e.g., Helium and Nitrogen). The valves are micro-pneumatic membrane valves fabricated using photolithography and soft lithography (PDMS). The "selector switch" is a series of external pneumatic control lines. Applying pressure to one control line deflects a membrane to close one gas channel while a lack of pressure on the second line leaves its corresponding channel open, allowing for precise, low-volume gas selection.
- ```
graph TD
    subgraph Microfluidic Chip
        direction LR
        C1[Carrier Gas 1 In] --> M1{Membrane Valve 1};
        C2[Carrier Gas 2 In] --> M2{Membrane Valve 2};
        M1 --> O[GC Column];
        M2 --> O;
    end
    P1[Pneumatic Control 1] --Pressure--> M1;
    P2[Pneumatic Control 2] --Vent--> M2;
```

3. Cross-Domain Application

Derivative 1.5: Aerospace - Redundant Hydraulic Systems
- Enabling Description: In an aircraft flight control system, the "fuel sources" are two independent hydraulic systems (System A and System B). The "engine" is a flight control actuator for a rudder or aileron. The selector switch is a manual override lever in the cockpit or maintenance bay. It mechanically actuates two hydraulic shuttle valves. In the event of a failure in System A, the pilot or ground crew can manually slide the selector, which physically isolates the failed system and ensures the actuator is powered exclusively by System B, preventing hydraulic fluid mixing or pressure loss.
- ```
stateDiagram-v2
    [*] --> SystemA_Active
    SystemA_Active: Actuator powered by Hydraulic System A
    SystemB_Active: Actuator powered by Hydraulic System B

    SystemA_Active --> SystemB_Active: Manual Selector Moved (isolates A, engages B)
    SystemB_Active --> SystemA_Active: Manual Selector Moved (isolates B, engages A)
```
Derivative 1.6: AgTech - Dual-Source Irrigation
- Enabling Description: The "fuel sources" are a municipal water line and a rainwater collection tank. The "engine" is a field irrigation system. The selector switch is a large, durable lever on a valve manifold at the head of the field. It is mechanically linked to two 4-inch gate valves. A farmer can manually switch between using treated municipal water (e.g., during a drought) and free, untreated rainwater (when available), ensuring the irrigation system can only draw from one source at a time to prevent backflow and contamination of the municipal supply.
- ```
graph BT
    E[Irrigation Emitters] <-- M[Main Line];
    V1[Gate Valve 1] --> M;
    V2[Gate Valve 2] --> M;
    S[Selector Lever] --Linkage--> V1;
    S --Linkage--> V2;
    F1[Municipal Water] --> V1;
    F2[Rainwater Tank] --> V2;
```

4. Integration with Emerging Tech

Derivative 1.7: IoT-Enabled Selector with Predictive Maintenance
- Enabling Description: The manual selector switch is augmented with IoT sensors. A rotational position sensor (a simple potentiometer or Hall effect sensor) on each valve stem reports the open/closed status to a microcontroller (ESP32). An accelerometer on the selector switch detects when it is moved. The ESP32 transmits this data via LoRaWAN to a cloud platform. The platform uses an AI model to analyze the frequency of switching, time spent on each fuel, and correlates it with generator load data. It predicts when valve seals may require replacement and sends a maintenance alert. The manual override is preserved for safety.
- ```
sequenceDiagram
    participant Generator
    participant SelectorSwitch
    participant MCU
    participant LoRaWAN_Gateway
    participant Cloud_AI

    User->>SelectorSwitch: Manually switch fuel
    SelectorSwitch->>MCU: Transmit position change (via Hall sensor)
    MCU->>LoRaWAN_Gateway: Send data packet {Valve1:0, Valve2:1}
    LoRaWAN_Gateway->>Cloud_AI: Forward packet
    Cloud_AI->>Cloud_AI: Log event & run predictive model
    Cloud_AI-->>Maintenance_Portal: Alert: "Valve 2 approaching service interval"
```

5. The "Inverse" or Failure Mode

Derivative 1.8: Failsafe Neutral-Position Selector
- Enabling Description: The selector switch has three positions instead of two: "Fuel 1," "Fuel 2," and "OFF/SAFE." The OFF position is a detent in the center of travel. In this position, the mechanical linkage ensures both fuel valves are held securely in the closed position. This is the required position for transporting the generator. The linkage is designed with an over-center cam mechanism so that if the switch is jostled or not fully engaged in a fuel position, the springs in the cam will force it back to the central OFF position, preventing any fuel flow.
- ```
stateDiagram-v2
    [*] --> OFF
    OFF: Both valves closed
    Fuel1: Valve 1 open, Valve 2 closed
    Fuel2: Valve 2 open, Valve 1 closed

    OFF --> Fuel1: Slide Switch Left
    Fuel1 --> OFF: Slide Switch Center

    OFF --> Fuel2: Slide Switch Right
    Fuel2 --> OFF: Slide Switch Center

    Fuel1 --> Fuel2: Not Possible (must pass through OFF)
    Fuel2 --> Fuel1: Not Possible (must pass through OFF)
```

Derivatives of Independent Claim 17: Solenoid-Interlocked Selector

Claim 17 Core Concept: A selector switch with two fuel modes that also triggers a solenoid switch to open/close a fuel solenoid, working in concert with a mechanical valve assembly.

1. Material & Component Substitution

Derivative 17.1: Latching Solenoid Valve System
- Enabling Description: The fuel solenoid is replaced with a magnetic latching solenoid valve. This type of valve requires only a short electrical pulse to switch states (open or closed) and then remains in that state with no further power consumption, held in place by a permanent magnet. The selector switch, when moved, momentarily closes one of two circuits: one to send an "open" pulse, the other a "close" pulse. This dramatically reduces the standby power drain on the generator's battery, which is critical for devices with long periods of inactivity. The solenoid itself is constructed with a Kalrez® perfluoroelastomer seal for compatibility with a wide range of fuel chemistries.
- ```
flowchart TD
    subgraph Control
        SS[Selector Switch]
        P[Pulse Generator]
    end
    subgraph Fuel Line
        LSV[Latching Solenoid Valve]
    end
    SS --Position 1--> P --"Open" Pulse--> LSV;
    SS --Position 2--> P --"Close" Pulse--> LSV;
    LSV --Stays Open/Closed w/o Power--> ;
```

2. Operational Parameter Expansion

Derivative 17.2: High-Pressure Gaseous Fuel Switching (300 Bar)
- Enabling Description: This system is designed for switching between Compressed Natural Gas (CNG) and Hydrogen (H2) at pressures up to 300 bar. The solenoid valve is a high-pressure, pilot-operated design. The selector switch triggers a small, low-power solenoid (the pilot) which then uses the high-pressure gas itself to actuate the main valve piston, enabling control of the high-pressure flow with minimal electrical power. The valve body is 316L stainless steel, and all wetted components are compliant with hydrogen service requirements to prevent embrittlement.
- ```
graph LR
    S[Selector Switch] --> PS[Pilot Solenoid];
    F_HP_In[High-Pressure Fuel In] --> MV[Main Valve];
    F_HP_In --Pilot Line--> PS;
    PS --Control Pressure--> MV[Main Piston];
    MV --> F_HP_Out[Fuel to Engine];
```

3. Cross-Domain Application

Derivative 17.3: Chemical Processing Plant - Reagent Selection
- Enabling Description: In a batch chemical reactor, the "fuel sources" are two different liquid reagents (e.g., an acid and a base). The selector switch is on a control panel. When the process calls for the acid, the operator selects "Reagent A." This energizes a solenoid which opens the valve for the acid line. The selector switch also sends a signal to the plant's PLC (Programmable Logic Controller), which verifies via a flow meter that the acid is flowing before proceeding with the reaction. The electrical interlock via the solenoid prevents the accidental, simultaneous addition of incompatible reagents.
- ```
sequenceDiagram
    Operator->>SelectorPanel: Select Reagent A
    SelectorPanel->>Solenoid_A: Energize
    Solenoid_A->>Valve_A: Open
    SelectorPanel->>PLC: Signal Mode=Reagent_A
    Valve_A->>FlowMeter_A: Fluid Flow
    FlowMeter_A->>PLC: Report Flow Rate
    PLC->>PLC: Verify Flow_A > 0 AND Valve_B is closed
    PLC->>ProcessControl: Proceed with next step
```

4. Integration with Emerging Tech

Derivative 17.4: Blockchain-Verified Fuel Source
- Enabling Description: The system is integrated into a supply chain that requires provenance of fuel, such as sustainable biofuel. The selector switch's electrical contacts are wired to a cryptographic co-processor. When "Biofuel" mode is selected, the co-processor reads an NFC tag on the biofuel tank's coupling, which contains a signed hash of its batch data. The processor verifies the signature and writes a new transaction to a private blockchain, e.g., "Generator SN#123 consumed 1 liter from Biofuel Batch #XYZ at [Timestamp]." This creates an immutable log for carbon credit verification. The solenoid for the conventional fuel source is physically disabled until the blockchain transaction is confirmed.
- ```
graph TD
    A[Select Biofuel Mode] --> B{Read NFC Tag on Tank};
    B --> C{Verify Batch Signature};
    C --Valid--> D{Enable Biofuel Solenoid};
    C --Invalid--> E{Lockout; Alert User};
    D --> F{Log Consumption Event};
    F --> G((Write Transaction to Blockchain));
```

5. The "Inverse" or Failure Mode

Derivative 17.5: De-energize-to-Close Purge System
- Enabling Description: The primary function is to ensure a safe shutdown. The fuel solenoid is a "normally open" valve that is held closed by continuous power when the generator is running. When the user moves the selector switch to "OFF," or if the generator loses battery power, the solenoid de-energizes and the valve springs open. This valve doesn't feed fuel to the engine, but rather opens a line to an inert gas (e.g., Nitrogen) purge system. This action flushes any remaining flammable fuel vapor from the lines and carburetor before a long-term shutdown, reducing the risk of fire or gum deposits.
- ```
stateDiagram-v2
    state "Running" as Running
    state "Purging" as Purging
    state "OFF" as Off

    [*] --> Off
    Off --> Running: Start Generator & Select Fuel
    Running --> Purging: Select "OFF" or Power Loss
    Purging --> Off: Purge Cycle Complete

    state Running {
        direction LR
        PurgeSolenoid: Energized (Closed)
        FuelSolenoid: Energized (Open)
    }
    state Purging {
        direction LR
        PurgeSolenoid: De-energized (Open)
        FuelSolenoid: De-energized (Closed)
    }
```

Combination Prior Art Scenarios

Combination with Modbus Protocol:
- Scenario: The fuel selector switch (as in Derivative 1.7 with IoT sensors) is integrated into an industrial generator that uses the Modbus RTU open-source protocol for communication over an RS-485 serial line. The microcontroller acts as a Modbus slave device.
- Enabling Description: The microcontroller's firmware includes a Modbus slave library. It maps the status of the two fuel valves (open/closed) and the solenoid to discrete input registers (Coils). A master controller (like a SCADA system) can poll the generator's selector switch for its status (Register 0x01 for Fuel 1, 0x02 for Fuel 2). This allows for remote monitoring and data logging of fuel selection within standard industrial control systems, making the manual switch part of a larger automated system. This combination is obvious to anyone skilled in industrial automation.
Combination with MQTT Protocol for IoT Fleets:
- Scenario: A fleet of portable dual-fuel generators, each equipped with the IoT-enabled selector (Derivative 1.7), uses the open-source MQTT (Message Queuing Telemetry Transport) protocol to report their status.
- Enabling Description: The ESP32 microcontroller on each selector switch acts as an MQTT client. Upon a change in the selector's state, it publishes a JSON payload to a specific topic on a central MQTT broker. For example, telemetry/generator/SN123/fuel_status with payload {"selected_fuel": "LPG", "timestamp": "2026-05-14T10:00:00Z"}. A dashboard subscribed to the telemetry/generator/+/fuel_status wildcard topic can monitor the entire fleet's fuel usage in real-time. This is a standard architecture for managing fleets of IoT devices.
Combination with Controller Area Network (CAN Bus) Standard:
- Scenario: The fuel selector switch (as in Derivative 17.2 or 1.5) is installed on a vehicle or heavy equipment that uses the CAN bus protocol (ISO 11898) for internal communication.
- Enabling Description: The selector switch is connected to a CAN controller. When the switch position changes, the controller broadcasts a standard CAN frame onto the bus. The frame would have a specific identifier (e.g., 0x1F0 for "Fuel System Status") and a data payload indicating the selected fuel (e.g., 0x01 for gasoline, 0x02 for LPG). The Engine Control Unit (ECU) on the same CAN bus receives this message and adjusts engine parameters (ignition timing, fuel trim) for the selected fuel. This makes the mechanical switch a seamless electronic component in modern vehicle architecture.