Patents by Inventor Robert H. Hunt-Grubbe

Robert H. Hunt-Grubbe 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).

  • Measuring instruments
    Patent number: 5548900
    Abstract: In a downhole measuring caliper for oil well casings, comprising a circumferential array of radially extensible sensing fingers (30) between upper and lower sets of centralizing arms, the fingers are actuated through integral pre-stressed spring arms (34) engaged with an actuating member on the axis of the instrument; relative axial movement between the array of fingers and the actuating member causes the fingers to pivot into measuring contact with the tube wall. The number of sensing fingers is maximized and maintenance is simplified.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: August 27, 1996
    Inventor: Robert H. Hunt-Grubbe
  • Calibrator for radioactivity well logging tools
    Patent number: 4085323
    Abstract: A radioactivity logging tool including a gamma ray detector is field calibrated with the help of a sleeve that has a radioactive material distributed therein and is clamped about the tool so as to completely surround the detector. The radioactive material is peferably uranium 238. It can be either distributed uniformly inside the sleeve or take the form of wires which extend along generatrices or circumferences of the sleeve.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: April 18, 1978
    Assignee: Schlumberger Technology Corporation
    Inventors: Ronald E. Turcotte, Robert H. Hunt-Grubbe