Patents by Inventor George David Allen

George David Allen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Extendable ramp assembly for detecting an obstruction and responding thereto
    Patent number: 6598253
    Abstract: An extendable ramp assembly includes a chassis, a first ramp slidably movable relative to the chassis and hingably connected to the chassis, and a second ramp carried by the first ramp and movable relative to the chassis and the first ramp. Separate structure is provided for extending and retracting both the first and second ramps. A first mechanism is provided for detecting whether either or both of the first and second ramps abuts an obstruction when at least one of the ramps is being extended. A second mechanism is provided for stopping the extension of at least one of the ramps or for retracting at least one of the ramps in the event of the detecting mechanism detecting the obstruction.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: July 29, 2003
    Inventors: Robert John Allen, George David Allen