Patents by Inventor William D. Gilmour, deceased

William D. Gilmour, deceased 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).

  • Radio signalling systems
    Patent number: 4300236
    Abstract: This invention is a radio frequency identity system in which each user has a token containing a low power transmitter. If he wants to enter a security area, a receiver operates to let him enter if it recognizes that the transmission is correct. A correct transmission is one having a set number of R.F. carrier cycles between successive modulation pulses.In an alarm system a user can identify himself in a similar manner.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: November 10, 1981
    Assignee: Lewis Security Systems Limited
    Inventor: William D. Gilmour, deceased
  • Radio signalling systems
    Patent number: 4162448
    Abstract: This invention is a radio frequency identity system in which each user has a token containing a low power transmitter. If he wants to enter a security area, a receiver operates to let him enter if it recognizes that the transmission is correct. A correct transmission is one having a set number of R.F. carrier cycles between successive modulation pulses.In an alarm system a user can identify himself in a similar manner.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: July 24, 1979
    Assignee: Lewis Security Systems Limited
    Inventor: William D. Gilmour, deceased