Patents by Inventor Al Stigvils

Al Stigvils 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).

  • Intrusion alarm and automatic illumination system
    Patent number: 4796010
    Abstract: An intrusion alarm system provides automatic illumination of an entranceway when the entrance door is opened and sounds an audible alarm if the system is not disarmed within a brief predetermined time after the door is opened. The light which is used to illuminate the entranceway is also controlled independently of the alarm system by a conventional wall mounted on/off switch.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: January 3, 1989
    Inventors: Robert T. Bland, Al Stigvils