Patents by Inventor Richard Waddell

Richard Waddell 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).

  • Patent number: 5235933
    Abstract: There is described an improved device for indicating the status of a room or adjoining space, the device including first and second plates hingedly connected to one another along adjacent edges thereof, a spring urging the second plate into a normally closed position overlying and parallel to the first plate to the surface of a door. A magnet or equivalent devices are used to temporarily connect the second plate to a second surface, such as a door frame, adjacent to and extending at an angle to the surface of the door, wherein relative movement of the door away from the second surface breaks the connection between the second plate and the second surface, whereupon the second plate automatically returns to its normally closed position.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: August 17, 1993
    Inventors: Robert Pare, Mervin Stanzel, Richard Waddell, Allan Weatherall