Patents Assigned to Allis-Chalmers Energy, Inc.
  • Apparatus for, and method of, landing items at a well location
    Patent number: 7287598
    Abstract: An apparatus for, and method of, lowering items from a drilling rig to a well located below it through the use of a landing string comprised of drill pipe having an enlarged diameter section with a shoulder, in combination with upper and lower holders having wedge members with shoulders that engage and support the drill pipe at the shoulder of the enlarged diameter section, the shoulder of the drill pipe and the shoulders of the wedge members being rotatable with respect to each other.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: October 30, 2007
    Assignee: Allis-Chalmers Energy, Inc.
    Inventors: Burt A. Adams, Norman A. Henry