Patents by Inventor David A. Tjornhom, Sr.

David A. Tjornhom, Sr. 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).

  • Apparatus for mounting and removing electrical adapter from a socket
    Patent number: 4183604
    Abstract: An adapter for a conventional threaded electric light socket or the like having an external right hand threaded base for threading into a conventional socket. A locking tab on the base permits the adapter to be threaded into the socket and jams the threads of the socket to prevent its removal. The adapter has a cavity with an internal left hand thread for receiving an unconventional bulb or the like with a mating left hand threaded base. In one form, the adapter has a releasable lock structure for holding the adapter in the socket. A removal tool is used to release the lock structure to permit the adapter to be turned into and out of the socket.
    Type: Grant
    Filed: June 5, 1978
    Date of Patent: January 15, 1980
    Inventor: David A. Tjornhom, Sr.
  • Electrical adapter
    Patent number: 4093333
    Abstract: An adapter for a conventional threaded electric light socket or the like having an external right hand threaded base for threading into a conventional socket. A locking tab on the base permits the adapter to be threaded into the socket and jams the threads of the socket to prevent its removal. The adapter has a cavity with an internal left hand thread for receiving an unconventional bulb or the like with a mating left hand threaded base. In one form, the adapter has a releasable lock structure for holding the adapter in the socket. A removal tool is used to release the lock structure to permit the adapter to be turned into and out of the socket.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: June 6, 1978
    Inventor: David A. Tjornhom, Sr.