Patents by Inventor Donald P. Cummings

Donald P. Cummings 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: 5012581
    Abstract: A utility knife especially suitable for use by either right-handed or left-handed persons includes a generally symmetrical casing, as viewed from the side, having a generally pointed leading edge and two surfaces sloping back at equal angles from the point. When a standard razor-like blade is positioned in the knife, the midpoint of the blade between its sharpened cutting edge and non-sharpened opposite edge, lies on an imaginary line extending from the point at the forward end of the casing and generally through the center of the knife. The blade may be positioned with its cutting edge being on one side or the other side of the imaginary centerline. In either position, the cutting edge of the blade will project similarly from the casing when a thumb piece is pushed toward the forward end.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: May 7, 1991
    Assignee: Hyde Manufacturing Co.
    Inventors: William D. Fletcher, David H. Mallalieu, Donald P. Cummings
  • Patent number: D291404
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: August 18, 1987
    Assignee: Hyde Mfg. Co.
    Inventors: Donald P. Cummings, Robert T. Howitt
  • Patent number: D319379
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: August 27, 1991
    Assignee: Hyde Manufacturing Co., Inc.
    Inventors: Donald P. Cummings, Robert T. Howitt, David H. Mallalieu
  • Patent number: D344825
    Type: Grant
    Filed: September 18, 1990
    Date of Patent: March 1, 1994
    Assignee: Hyde Manufacturing Company
    Inventors: Donald P. Cummings, Robert Howitt, David H. Mallalieu