Patents by Inventor Johnson, Charles S.

Johnson, Charles S. 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).

  • Subsea well hanger
    Patent number: 5082060
    Abstract: A hanger comprising two tubular sections, one partially received within the other, one section having a serrated surface and the other section retaining at least one detent whereby the axial length of the hanger is adjustable. This arrangement obviates the disadvantage in the conventional tie-back method of sub-sea wellhead completion wherein it is necessary to cut and dress the casing after pulling tension in the casing string.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: January 21, 1992
    Assignee: National-Oilwell (U.K.) Limited
    Inventors: Johnson, Charles S., Robert Hart