Patents by Inventor David A. DeWitt

David A. DeWitt 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).

  • Flexible paper fastener
    Patent number: 4084911
    Abstract: A flexible paper fastener of the type having a flexible plastic tubular member flattened at its midportion, a stiff keeper having friction locks engaging opposite end portions of the tubular member, and a stiff U-shaped bridge releasably engaged in the ends of the tubular member is heat sealed along its midportion to a plastic laminated pressure sensitive adhesive sheet for mounting on a support.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: April 18, 1978
    Assignee: Ames Safety Envelope Company
    Inventor: David A. DeWitt