Patents by Inventor Erwin Parkell

Erwin Parkell 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).

  • Manual file and sharpening tool
    Patent number: D348598
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: July 12, 1994
    Assignee: Edgecraft Corp.
    Inventors: Daniel D. Friel, Jr., Erwin Parkell