Patents by Inventor Ethel Keller

Ethel Keller 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).

  • Cake pan
    Patent number: D252551
    Type: Grant
    Filed: June 27, 1977
    Date of Patent: August 7, 1979
    Inventor: Ethel Keller
  • Cookie cutter
    Patent number: D257624
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: December 16, 1980
    Inventor: Ethel Keller