Patents by Inventor Serge-Andre Droz

Serge-Andre Droz 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).

  • Alarm device for a door, automatically switched off during a licit access
    Patent number: 4370644
    Abstract: An alarm device for doors having in series an electric supply, such as batteries, three switches and a relay. The relay is locked upon the simultaneous closing of the three switches and actuates an alarm circuit. The first and second switches are respectively closed and open when the door is closed and respectively open and closed when the door is fully open. The three switches are closed during the opening and closing of the door and when the door is ajar and the door bolt is retracted. The third switch is controlled by the bolt and is closed except when the bolt is retracted.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: January 25, 1983
    Inventor: Serge-Andre Droz