Patents by Inventor Henry R. De Graan

Henry R. De Graan 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).

  • Washer
    Patent number: 4292876
    Abstract: An improved steel and neoprene bonded washer having a crowned steel washer with an inner elastomeric washer. The elastomeric washer is adjacent to the concave surface of the crowned washer. The steel washer has a generally flat outer ring and a conical portion extending from the outer ring toward the central opening. The angle of the sides of the conical portion is between 30.degree. and 50.degree. with respect to the flat portion.
    Type: Grant
    Filed: August 2, 1979
    Date of Patent: October 6, 1981
    Inventor: Henry R. De Graan