Patents Represented by Attorney, Agent or Law Firm John D. Jeter
  • Oil well service tool
    Patent number: 4413516
    Abstract: Apparatus for reducing landing shock for instruments run into earth boreholes through drill string bores and to maintain azimuthal orientation being protected with enclosing structure. An instrument package has a depending spear point for engaging a baffle in the drill string. The spear point encloses a spring and fluid damped shock absorber. The instrument package further includes a second internal fluid damped shock absorber and a spring type rotary shock absorber for the measuring instrument.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: November 8, 1983
    Assignee: Oil-Well Drilling Control, Inc.
    Inventors: Robert E. Croom, Jr., John D. Jeter
  • Downhole motor rotor supports
    Patent number: 4080094
    Abstract: Method and apparatus to lift the rotor of an earth borehole downhole drilling motor with a resilient force that exceeds the rotor weight so that starting of the motor is more certain due to reduced drag on primary thrust bearings. Additionally the apparatus may be used to reduce imbalanced axial loads on rotor primary thrust bearings.
    Type: Grant
    Filed: August 16, 1976
    Date of Patent: March 21, 1978
    Assignee: Eastman-Whipstock, Inc.
    Inventor: John Doise Jeter