Patents by Inventor Paul George Craig

Paul George Craig 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).

  • Removable drill bit nozzle
    Patent number: 4082015
    Abstract: A nozzle is releasably locked in a drilling fluid passage of a rotary rock bit by a retainer member which bridges between matching grooves in the periphery of the nozzle and in the wall of the passage respectively. The retainer member is introduced to the matching grooves through a first passageway that extends from the surface of the bit to the matching grooves. The grooves lie in a common plane. A second passageway extends at an angle to the common plane from the surface of the bit to the matching grooves. A drive-out tool is inserted through the second passageway to remove the retainer member.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: April 4, 1978
    Assignee: Dresser Industries, Inc.
    Inventor: Paul George Craig
  • Removable drill bit nozzle
    Patent number: 4019593
    Abstract: A nozzle is releasably locked in a drilling fluid passage of a rotary rock bit by a retainer member which bridges between matching grooves in the periphery of the nozzle and in the wall of the passage respectively. The retainer member is introduced to the matching grooves through a first passageway that extends from the surface of the bit to the matching grooves. The grooves lie in a common plane. A second passageway extends at an angle to the common plane from the surface of the bit to the matching grooves. A drive-out tool is inserted through the second passageway to remove the retainer member.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: April 26, 1977
    Assignee: Dresser Industries, Inc.
    Inventor: Paul George Craig