Patents by Inventor Paul A. Dards

Paul A. Dards 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).

  • Smoke screen intruder deterrent system
    Patent number: 5394139
    Abstract: An intruder deterrent system of the type which generates a smoke screen and which includes an intruder detector, a smoke screen generator operatively linked to the intruder detector means and the smoke screen generator to activate the smoke screen generator when the intruder detector is triggered; and smoke screen density regulator having a smoke screen density sensor to sense the density of the smoke screen and a controller responsive to the sensed density to adjust the output of the smoke screen generator means to maintain the smoke screen density at a desired level.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: February 28, 1995
    Inventor: Paul A. Dards