Patents by Inventor Richard D. Cashman

Richard D. Cashman 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).

  • Door alarm system
    Patent number: 4124847
    Abstract: A door switch is mounted on a door and has a switch arm coupled to the door frame. The door switch is open when the door is closed and is moved to closed position when the door is opened at least approximately 35.degree.. Electrical conductors electrically connect an alarm, an ON-OFF switch and the door switch in circuit to a source of electrical energy whereby when the ON-OFF switch is closed and the door is opened beyond approximately 35.degree., the alarm is actuated.
    Type: Grant
    Filed: April 20, 1977
    Date of Patent: November 7, 1978
    Inventor: Richard D. Cashman