Patents by Inventor Donald G. Cross

Donald G. Cross 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).

  • Polycrystalline diamond bearing system for a roller cone rock bit
    Patent number: 4802539
    Abstract: A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise polycrystalline diamond. The invention also includes a member for retaining the roller cone on the journal.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: February 7, 1989
    Assignee: Smith International, Inc.
    Inventors: David R. Hall, Donald G. Cross
  • Polycrystalline diamond bearing system for a roller cone rock bit
    Patent number: 4738322
    Abstract: A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise polycrystalline diamond. The invention also includes a means for retaining the roller cone on the journal.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: April 19, 1988
    Assignee: Smith International Inc.
    Inventors: David R. Hall, Donald G. Cross
  • Bellows lubricant pressurizer for sealed bearing rock bits
    Patent number: 4577705
    Abstract: This invention discloses the utilization of a metal bellows in a grease reservoir cavity that is compressed during a rock bit grease filling process to create a positive pressure differential between the internal cavities in the bit and the outside atmosphere.
    Type: Grant
    Filed: April 23, 1984
    Date of Patent: March 25, 1986
    Assignee: Smith International, Inc.
    Inventor: Donald G. Cross