Patents by Inventor Donald J. Mitchell

Donald J. Mitchell 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).

  • Mat board cutter with knife blade securing safety pin
    Patent number: 4506576
    Abstract: A mat board cutter in which a knife blade carrying pivot block mounted on a slidable body also carries a safety pin that must be pushed against a spring to a release position to allow removal of the knife blade from the pivot block.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: March 26, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dennis L. Crawford, Donald J. Mitchell