Patents by Inventor David A. Greufe

David A. Greufe 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).

  • Novelty hat
    Patent number: D285983
    Type: Grant
    Filed: April 26, 1984
    Date of Patent: October 7, 1986
    Inventor: David A. Greufe
  • Eyewear
    Patent number: D309148
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: July 10, 1990
    Inventor: David A. Greufe