Patents by Inventor Tom C. Montgomery

Tom C. Montgomery 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).

  • Variable magnetic lock
    Patent number: 3971581
    Abstract: A variable remote control locking device comprising an electromagnet arranged to contact a ferrous metal plate to lock a door, a variable current supply for controlling the electromagnet, a remote transmitter and a receiver to control the variable current supply. Force exerted by the electromagnet is varied by a signal from the remote transmitter to the receiver which energizes a relay to change the variable current supply, thereby varying the current to the electromagnet and thereby regulate the force required to open the door.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: July 27, 1976
    Inventor: Tom C. Montgomery