Patents by Inventor Lindsay R. Grist

Lindsay R. Grist 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).

  • Tractor/trailer lamp circuit continuity test device
    Patent number: 5604439
    Abstract: An auxiliary plug-and-socket assembly (28) has a plurality of pins (29) at one end which plug into a socket (30) at the rear end of a tractor vehicle (31) and sockets (32) at the other end which receive a plug (33) from a trailer vehicle. The auxiliary assembly (28) also has conductors (38) which extend between corresponding pins (29) and sockets (32), light emitting diodes (20-25) in respective circuits between conductors (38) and a common ground pin and socket, a gating diode (37), and an energizer (17) and switch (34) bridging the gating diode (37).
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: February 18, 1997
    Inventors: Clifford L. Walkington, Lindsay R. Grist