Patents by Inventor Gary D. Marble

Gary D. Marble 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).

  • Convertible ground safety plug
    Patent number: 4954091
    Abstract: A convertible ground safety plug is provided and consists of a grounding prong carried in an insulated housing. The ground prong can be moved between an active position projecting outwardly from the housing and an inactive position not projecting outwardly from the housing, so that the plug can be utilized for a three slot receptacle and a two slot receptacle.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: September 4, 1990
    Inventors: Steven C. Marble, Gary D. Marble