Patents by Inventor Ralph W. Keen

Ralph W. Keen 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).

  • Hairbrush
    Patent number: D358489
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: May 23, 1995
    Assignee: Mebco Industries, Inc.
    Inventors: Melvin E. Balster, Delton A. Kruschke, James B. Easley, Ralph W. Keen
  • Hairbrush handle
    Patent number: D358490
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: May 23, 1995
    Assignee: Mebco Industries, Inc.
    Inventors: Melvin E. Balster, Delton A. Kruschke, James B. Easley, Ralph W. Keen