Patents by Inventor David Doig

David Doig 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 switches
    Patent number: 3944762
    Abstract: A key operated switch device in which any one of a set of different keys may be utilized to operate a particular combination of sets of electrical contacts unique to that key, the sets of electrical contacts being provided by reed switches located adjacent a keyway adapted to receive any one of the keys in said set, and the keys incorporating different arrangements of magnets or magnetized zones adapted to actuate different combinations of said reed switches.
    Type: Grant
    Filed: September 11, 1974
    Date of Patent: March 16, 1976
    Assignee: Veeder Industries, Inc.
    Inventors: Arthur Coleman, Andrew Swan, David Doig
  • Textile fabric
    Patent number: D257795
    Type: Grant
    Filed: December 19, 1978
    Date of Patent: January 6, 1981
    Assignee: The Scotch House Limited
    Inventor: David Doig