Patents by Inventor David Ringel

David Ringel 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).

  • Frame for exercise or similar article
    Patent number: D290281
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: June 9, 1987
    Inventors: David Ringel, Kenneth Domzalski
  • Exercise frame
    Patent number: D291338
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: August 11, 1987
    Inventors: David Ringel, Kenneth Domzalski
  • Exercise frames or similar article
    Patent number: D298346
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: November 1, 1988
    Inventors: David Ringel, Kenneth Domzalski