Patents by Inventor Roy A. Fields

Roy A. Fields 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).

  • Light signal for door knob and lock assembly
    Patent number: 4683741
    Abstract: A door knob and lock assembly having a pair of knobs, a latching bolt operable by the rotation of the knobs, and a turn button to selectively arrest the movement of the bolt to place the assembly in locked condition. A battery operated electrical circuit including a switch operable by the turn button, and a light emitting diode mounted within the door knobs so as to be operable on locking the door to provide a flashing light visible from the outside of the door.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: August 4, 1987
    Inventor: Roy A. Fields