Patents by Inventor Bruce McGarain

Bruce McGarain 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).

  • Lockable motor assembly for use in a well bore
    Patent number: 6945328
    Abstract: A lockable motor assembly for use in a well bore comprises a PDM motor having a rotor and a stator. A locking member has a splined projection which is received within a splined recess of the rotor and external splines which mate with splines provided on a sub connected to the stator. The components are held in this configuration by a shear ring until the fluid pressure within a chamber defined between the locking member and the sub is sufficient to cause the shear ring to shear. The locking member may then move out of the engagement with the rotor to free the motor for operation. The locking member is held in this position by a ratchet mechanism.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: September 20, 2005
    Assignee: Smith International, Inc.
    Inventors: Brian Cruickshank, John P. Boyce, Christopher J. Caton, Bruce McGarain