Patents by Inventor Richard Forbes Donald-Hill

Richard Forbes Donald-Hill 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).

  • Anti-slip device for ladder rungs
    Patent number: 5692581
    Abstract: A cover for a rung of a ladder consisting of an elongate member (12) configured to spring clamp over the rung of the ladder and a layer (16) of anti-skid or anti-slip material removeably fastened to the external surface of the cover. The elongate member includes at least one aperture (13) at each terminal end to receive a bolt for fastening the elongate member to the rung of the ladder.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: December 2, 1997
    Inventors: John Robert Nelson, Richard Forbes Donald-Hill
  • Anti-skid staircase treads
    Patent number: 5645912
    Abstract: A means to provide a cost effective anti-skid/ anti-slip stairnose in staircases is described. The means can be dimensioned to fit across various lengths of staircases. A detachable anti-skid/ anti-slip conformable tape is fixed onto the stairnoses.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: July 8, 1997
    Inventors: John Robert Nelson, Richard Forbes Donald-Hill