Patents by Inventor James L. Duggan

James L. Duggan 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).

  • Methods of manufacturing and repairing steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses
    Patent number: 7216565
    Abstract: A steel body rotary drag bit for drilling a subterranean formation includes a plurality of support elements affixed to the bit body, each forming at least a portion of a cutting element pocket. Each of a plurality of cutting elements has a substantially cylindrical body and is at least partially disposed within a cutter pocket. At least a portion of the substantially cylindrical body of each cutting element is directly secured to at least a portion of a substantially arcuate surface of the bit body. At least a portion of a substantially planar surface of each cutting element matingly engages at least a portion of a substantially planar surface of a support element.
    Type: Grant
    Filed: March 14, 2006
    Date of Patent: May 15, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: William H. Sherwood, Jr., L. R. Borremans, Robert J. Costo, Jr., James L. Duggan
  • Steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses
    Patent number: 7070011
    Abstract: A steel body rotary drag bit for drilling a subterranean formation includes a plurality of support elements affixed to the bit body, each forming at least a portion of a cutting element pocket. Each of a plurality of cutting elements has a substantially cylindrical body and is at least partially disposed within a cutter pocket. At least a portion of the substantially cylindrical body of each cutting element is directly secured to at least a portion of a substantially arcuate surface of the bit body. At least a portion of a substantially planar surface of each cutting element matingly engages at least a portion of a substantially planar surface of a support element.
    Type: Grant
    Filed: November 17, 2003
    Date of Patent: July 4, 2006
    Assignee: Baker Hughes Incorporated
    Inventors: William H. Sherwood, Jr., L. R. Borremans, Robert J. Costo, Jr., James L. Duggan
  • Steel body drill bits with tailored hardfacing structural elements
    Patent number: 6651756
    Abstract: Hardfacing is deposited on a PDC-equipped steel body rotary drag bit and forms substantially protruding structural elements, such as wear knots or chip breakers. Hardfacing may also be applied to features such as gage pads, wherein at least two different hardfacing compositions are utilized and specifically located in order to exploit the material characteristics of each type of hardfacing composition employed. The use of multiple hardfacing compositions may further be employed as a wear-resistant coating on various elements of the drill bit. The surfaces to which hardfacing is applied may include machined slots, cavities or grooves providing increased surface area for application of the hardfacing. Additionally, such surface features may serve to effect a desired residual stress state in the resultant hardfacing layer or other structure.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: November 25, 2003
    Assignee: Baker Hughes Incorporated
    Inventors: Robert J. Costo, Jr., James L. Overstreet, Anton F. Zahradnik, James L. Duggan, Russel S. Smith, Mark E. Morris