Patents by Inventor Joel M. Wittkamp

Joel M. Wittkamp 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).

  • Telephone handset
    Patent number: D282363
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: January 28, 1986
    Assignee: International Business Machines Corporation
    Inventors: Henry Kapper, Walter F. Kraus, Joel M. Wittkamp
  • Caster cover
    Patent number: D382465
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: August 19, 1997
    Assignee: Rubbermaid Health Care Products Inc.
    Inventors: Shivaprasad Dhanapal, Brian H. Leonard, Joel M. Wittkamp