Patents by Inventor Robert G. Davidson

Robert G. Davidson 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).

  • Apparatus for releasing perforating gun equipment from a well casing
    Patent number: 5423382
    Abstract: Apparatus engageable with a well casing for suspending a perforating gun in the casing. The apparatus includes toothed slips forced into engagement with the well casing. A spring maintains an engaging force on the slips with the casing. In response to detonation of the perforating gun, a first release mechanism is operated to allow the perforating gun to drop a short distance. After initial dropping of the perforating gun, a second release mechanism is operated to release the engagement of the toothed slips with the casing, thereby allowing the entire unit to fall to the bottom of the well. A retrieval tool attached to a tubing string can be utilized to operate the second release mechanism, disengage the unit from the casing, and retrieve it from the well.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: June 13, 1995
    Assignee: Dresser Industries, Inc.
    Inventors: John A. Barton, Robert G. Davidson, James F. Wilkin