Patents by Inventor John F. Hopkins

John F. Hopkins 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).

  • Spring ring and hat ring seal
    Patent number: 4592558
    Abstract: A ring seal comprising a main body member having a U-shape cup recess opening on one side, usually having a U-shape metal spring located therein, and a hat ring with a solid projection fitting into the U-shape cup recess opening and having its opposite face being flat and normal to the ring axis. A back up ring adjacent the heel of the main body ring can be provided. An assembly of such ring seals can be stacked heel-to-heel; hat-ring-to-hat-ring or heel-to-hat-ring.
    Type: Grant
    Filed: October 17, 1984
    Date of Patent: June 3, 1986
    Assignee: Hydril Company
    Inventor: John F. Hopkins