Patents by Inventor David M. Epplin

David M. Epplin 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).

  • Gyroscopic steering tool using only a two-axis rate gyroscope and deriving the missing third axis
    Patent number: 7813878
    Abstract: A two-axis gyroscope used on a bottom hole assembly can be used for determining a rate of rotation about the rotational axis of a BHA. The method takes advantage of possible misalignment of at least one axis of the two axis gyroscope from orthogonality with respect to the rotational axis of the BHA, resulting in the misaligned gyro being sensitive to BHA rotation.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: October 12, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Robert A. Estes, Jonathan R. Bynum, Randell Riggs, David M. Epplin
  • Gyroscopic steering tool using only a two-axis rate gyroscope and deriving the missing third axis
    Patent number: 7234540
    Abstract: A two-axis gyroscope used on a bottom hole assembly can be used for determining a rate of rotation about the rotational axis of a BHA. The method takes advantage of possible misalignment of at least one axis of the two axis gyroscope from orthogonality with respect to the rotational axis of the BHA, resulting in the misaligned gyro being sensitive to BHA rotation.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: June 26, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: Robert A. Estes, Jonathan R. Bynum, Randell Riggs, David M. Epplin