Patents by Inventor J. Edwin Shirk

J. Edwin Shirk 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).

  • Portable powered stake puller
    Patent number: 5566924
    Abstract: The apparatus is a portable stake puller powered by a gasoline engine. The lifting action is produced by an endless chain conveyor that raises a jaw assembly which is pivoted to grip the spike. The jaw assembly is released from the chain by a mechanical unlatching action when it hits a stop near the top of a guiding channel, and, once released, the jaw assembly drops down to the bottom of the channel from its own weight, reconnects to the chain, and is ready to engage another spike.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: October 22, 1996
    Inventor: J. Edwin Shirk