Patents by Inventor John J. Warrick

John J. Warrick 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).

  • Patent number: 5423560
    Abstract: A hydraulic drive system is disclosed that has infinitely variable ratio without any need to reduce or remove power during shifts, requires very little effort to shift, and requires little or no effort to maintain shift position after shifting. It provides the ability to use single wheel drive, or multi-wheel drive with traction control, selectably. This invention may be used to power bicycles, but is not limited to bicycles as it may be built in any size or configuration.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: June 13, 1995
    Inventors: John J. Warrick, Robert M. Gilbert