Patents by Inventor Harry V. Nquyen

Harry V. Nquyen 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).

  • Automatic door safety system
    Patent number: 4866881
    Abstract: A system for controlling the opening and closing operation of a sliding door wherein at least two presence sensing detectors are disposed effective to cast beams in overlapping relation to one another and extending across the pathway of the door to be controlled, and manual means or motion detecting detectors effective to provide for the initiation of movement of the door to open position. Furthermore programmed computer means are included in the system for the controlled sequencing and pulsing of the presence sensing beams in the opening and closing operation of the door.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: September 19, 1989
    Assignee: Lanson Electronics, Inc.
    Inventors: Richard A. Morrow, Daniel C. Gionet, Lance Wikkerink, Harry V. Nquyen