Patents by Inventor James T. Craig, Jr.

James T. Craig, Jr. 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).

  • Directional drilling system
    Patent number: 4015673
    Abstract: This invention concerns the drilling of boreholes in the earth. It concerns a rotary drilling system having a particular bottom hole assembly (BHA) for use in increasing or decreasing the angle of deviation from the vertical of a borehole. It also teaches a method whereby the angle of deviation can be calculated for each assembly. There is one assembly disclosed for increasing the angle of deviation and another assembly disclosed for decreasing the angle of deviation. Also disclosed is a novel "universal stabilizer" for use in the bottom hole assembly.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: April 5, 1977
    Assignee: Standard Oil Company (Indiana)
    Inventors: James T. Craig, Jr., Arthur Park
  • Directional drilling system
    Patent number: 3961674
    Abstract: This invention concerns the drilling of boreholes in the earth. It concerns a rotary drilling system having a particular bottom hole assembly (BHA) for use in increasing or decreasing the angle of deviation from the vertical of a borehole. It also teaches a method whereby the angle of deviation can be calculated for each assembly. There is one assembly disclosed for increasing the angle of deviation and another assembly disclosed for decreasing the angle of deviation. Also disclosed is a novel "universal stabilizer" for use in the bottom hole assembly.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: June 8, 1976
    Assignee: Standard Oil Company
    Inventors: James T. Craig, Jr., Arthur Park