Patents by Inventor John F. Cressey

John F. Cressey 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).

  • Method of inserting wireline equipment into a subsea well
    Patent number: 4993492
    Abstract: A subsea wireline lubricator comprises in sequence (a) a stuffing box, (b) at least one blow-out preventer, (c) a riser, (d) a foot valve and (e) a connector for connection to a subsea well head assembly.The lubricator permits wireline access to subsea oil wells without the need for a conventional tensioned riser.
    Type: Grant
    Filed: June 1, 1990
    Date of Patent: February 19, 1991
    Assignee: The British Petroleum Company, p.l.c.
    Inventors: John F. Cressey, Ian J. Hardy