Patents by Inventor Nicholas D. Wren

Nicholas D. Wren 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).

  • Device to provide continuously variable gearing
    Patent number: 6447421
    Abstract: A mechanical transmission device for modifying torque and speed of rotation form torque input to torque output, more particularly a device capable of modifying torque and speed of rotation in a continuously variable fashion utilizing a single set of levers in conjunction with an abaxial ring.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: September 10, 2002
    Inventor: Nicholas D. Wren
  • Front chain wheel chain guide
    Patent number: 4832667
    Abstract: An overshift preventer comprising a guard plate having a chain biasing region, a base member integral with the guard plate and adjustable horizontally adjacent the chain gears of a bicycle, and a clamp for supporting the base member and for mounting the guard plate to a bicycle seat tube perpendicularly in a spaced parallel relationship to the front chain gears.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: May 23, 1989
    Inventor: Nicholas D. Wren