Patents by Inventor Roger P. Johns

Roger P. Johns 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).

  • Core cutting rock bit
    Patent number: 5394952
    Abstract: A roller cone drill bit is disclosed that leaves uncut a substantial formation core having a diameter from 10% to 25% of the bit gage diameter. The bit is designed to have normal size bearings, cone shell thickness and cutter protrusion to allow the use of standard drilling weights and RPM, thereby achieving a significant increase in drilling rate. When drilling abrasive formations, ultra hard cutting teeth are used in the cone apex to maintain the core diameter.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: March 7, 1995
    Assignee: Smith International, Inc.
    Inventors: Roger P. Johns, Gary Portwood, Gilbert S. Tyner, Charles R. Muren
  • Air percussion drilling assembly for directional drilling applications
    Patent number: 5305837
    Abstract: An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string. The air percussion hammer assembly is therefore ideally suited to directional drilling activities.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: April 26, 1994
    Assignee: Smith International, Inc.
    Inventors: Roger P. Johns, Michael S. Oliver, Huy D. Bui
  • Air percussion drilling assembly for directional drilling applications
    Patent number: RE36166
    Abstract: An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string. The air percussion hammer assembly is therefore ideally suited to directional drilling activities.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: March 30, 1999
    Assignee: Smith International, Inc.
    Inventors: Roger P. Johns, Michael S. Oliver, Huy D. Bui