Patents by Inventor David Lawrence Dowling

David Lawrence Dowling 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 warning system
    Patent number: 6292100
    Abstract: A door warning system comprising a sensor adapted to sense the presence of persons immediately adjacent a first side of a swinging door; an audio or visual alarm responsive to the sensor adapted to advise a person on a second side of the door being opposite the first side of the presence of a person on the first side of the door.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: September 18, 2001
    Assignee: D2 Technologies Pty Ltd.
    Inventor: David Lawrence Dowling