Patents by Inventor Robert C. Crooke

Robert C. Crooke 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 operated heavy lift system for vertically moving a string of pipe
    Patent number: 3949883
    Abstract: A system utilizing linear hydraulic cylinders for continuously raising or lowering a pipe string. Two sets of cylinders are spaced along the length of the pipe string. The cylinders are driven reciprocally with the cylinders in one set moving out of phase with the cylinders of the second set. Each set of cylinders includes means for releasably supporting the pipe string. The supporting means are operated out of phase so that one is released while the other is supporting the pipe. Control is such that the cylinder sets alternately raise or lower the pipe by incremental amounts, providing a continuous constant motion to the pipe string.
    Type: Grant
    Filed: June 13, 1974
    Date of Patent: April 13, 1976
    Assignee: Global Marine Inc.
    Inventors: Robert C. Crooke, Abraham Person