Patents by Inventor Bob Hooper

Bob Hooper 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).

  • Hydraulically actuated casing slip lifter with hinged wrap arm assembly
    Patent number: 6948904
    Abstract: A casing slip lifter includes a frame, upper and lower lift arm assemblies, at least one air cylinder connected to a pipe that rotates to pivot the arm assemblies, and a wrap arm to which the slips are attached and which is coupled to the arm assemblies by a hinge. The arm assemblies include mutually pivotable plates, one of which may be latched to enable the arm assemblies to be raised into one of two raised positions, depending on which the lower arm assembly is locked. The higher position permits the casing lifter to be used when centralizers are installed on the casing.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: September 27, 2005
    Inventors: Jack Bunn, Bob Hooper