Patents by Inventor Nicholas J. Harrop

Nicholas J. Harrop 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).

  • Plates for wafer check valves
    Patent number: 5392810
    Abstract: A metal plate 20 for a dual plate wafer check valve.A central portion 36 of the D shaped plate 20 is reinforced such as by means of a raised area 36 on either or both sides of the plate to resist deformation when subjected to reverse pressure in the valve closed position, while the D shaped edge portion 32 of the plate is made sufficiently flexible to maintain or improve sealing engagement with a valve seat even when the valve seat is distorted by the effect of reverse pressure in the valve closed position.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: February 28, 1995
    Assignee: Goodwin International Limited
    Inventors: James N. Cooper, Nicholas J. Harrop