Patents by Inventor Nigel M. Page

Nigel M. Page 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).

  • Sealing structure for a rock drill bit
    Patent number: 6578647
    Abstract: A sealing structure for a rock drill bit includes an elastomeric diaphragm for installation in the drill bit so as to separate grease from drilling mud. The diaphragm has an aperture extending through it, and a plug is disposed in the aperture so as to form a mechanical seal with a wall of the aperture. The plug has a channel therethrough which is normally held sealed by a face of the aperture in the diaphragm. If the pressure of the grease exceeds pressure in mud on the other side of the diaphragm by more than a critical value, the diaphragm aperture deforms and allows grease to move through the plug channel and escape. The critical value can be varied by using, with the same diaphragm, plugs having different numbers, sizes and axial positions of plug channels.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: June 17, 2003
    Assignee: James Walker & Company Limited
    Inventors: Nigel M. Page, Philip D. Embury
  • Sealing structure for a rock drill bit
    Publication number: 20020046884
    Abstract: A sealing structure for a rock drill bit includes an elastomeric diaphragm for installation in the drill bit so as to separate grease from drilling mud. The diaphragm has an aperture extending through it, and a plug is disposed in the aperture so as to form a mechanical seal with a wall of the aperture. The plug has a channel therethrough which is normally held sealed by a face of the aperture in the diaphragm. If the pressure of the grease exceeds pressure in mud on the other side of the diaphragm by more than a critical value, the diaphragm aperture deforms and allows grease to move through the plug channel and escape. The critical value can be varied by using, with the same diaphragm, plugs having different numbers, sizes and axial positions of plug channels.
    Type: Application
    Filed: July 25, 2001
    Publication date: April 25, 2002
    Inventors: Nigel M. Page, Philip D. Embury
  • Rotary drill bit with lip seal in roller cone bit
    Patent number: 6357540
    Abstract: A roller-cone drill bit in which a double lip seal, made of a self-lubricating elastomer, protects the bearings from the mud.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: March 19, 2002
    Assignees: Halliburton Energy Services, Inc., James Walker Co., Ltd.
    Inventors: Nigel M. Page, Philip D. Embury