Patents by Inventor James W. Spilker

James W. Spilker 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).

  • Die changer
    Patent number: 4056207
    Abstract: This device consists primarily of a portable frame, having a manually operated winch, which will elevate formed die clamps.
    Type: Grant
    Filed: July 15, 1976
    Date of Patent: November 1, 1977
    Inventor: James W. Spilker