Patents by Inventor Jeffrey Scott Hall

Jeffrey Scott Hall 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).

  • Key operated safety interlock switch
    Patent number: 6013881
    Abstract: An operating head assembly for a key operated safety switch contains within its housing two inwardly biased locking plates surrounding and locking an operating cam. A key with beveled faces forces the locking plates outward, freeing the cam to rotate. A cross bar on the key rotates the cam to the operating position. The safety switch is thus not easily defeated by simple devices.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: January 11, 2000
    Assignee: Honeywell Inc.
    Inventors: Jeffrey Scott Hall, Mark Andrew Mantua, David Elmer Olsen