Patents by Inventor David P. Duckworth

David P. Duckworth 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).

  • Elastomer-thermally conductive carbon fiber compositions for roller-cone drill bit seals
    Patent number: 10132120
    Abstract: The present disclosure relates to elastomer-thermally conductive carbon fiber compositions for use in seals for roller-cone drill bits. The present disclosure further relates to seals formed from such compositions and to roller-cone drill bits containing such seals.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: November 20, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: B. Raghava Reddy, Feng Liang, Ping C. Sui, David P. Duckworth
  • Symmetrical seal
    Patent number: 9988850
    Abstract: A downhole seal system for roller cone drill bits includes a seal gland having a width larger than it depth. In one implementation, the seal gland includes a protrusion along its base on which a seal element seats. The seal element is a single, annular seal element with a recess formed therein so as to define two lobes. The seal element seats in the gland so that the recess engages the protrusion. The lobes function as separate seal elements, although they are a single unitary seal element disposed in a single gland.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: June 5, 2018
    Assignee: HALLIBURTON ENERGY SERVICES, INC.
    Inventors: Micheal B. Crawford, Mark E. Williams, Young H. Lee, David P. Duckworth, Zhaohui Shan
  • ELASTOMER-THERMALLY CONDUCTIVE CARBON FIBER COMPOSITIONS FOR ROLLER-CONE DRILL BIT SEALS
    Publication number: 20160201397
    Abstract: The present disclosure relates to elastomer-thermally conductive carbon fiber compositions for use in seals for roller-cone drill bits. The present disclosure further relates to seals formed from such compositions and to roller-cone drill bits containing such seals.
    Type: Application
    Filed: September 19, 2014
    Publication date: July 14, 2016
    Inventors: B. Raghava REDDY, Feng LIANG, Ping C. SUI, David P. DUCKWORTH
  • SYMMETRICAL HAR SEAL
    Publication number: 20150345226
    Abstract: A downhole seal system for roller cone drill bits includes a seal gland having a width larger than it depth. In one implementation, the seal gland includes a protrusion along its base on which a seal element seats. The seal element is a single, annular seal element with a recess formed therein so as to define two lobes. The seal element seats in the gland so that the recess engages the protrusion. The lobes function as separate seal elements, although they are a single unitary seal element disposed in a single gland.
    Type: Application
    Filed: December 31, 2012
    Publication date: December 3, 2015
    Inventors: Michael B. Crawford, Mark E. Williams, Young H. Lee, David P. Duckworth, Zhaohui Shan
  • High performance rock bit grease
    Patent number: 8789623
    Abstract: The present disclosure relates to greases containing metal sulfonate thickeners. In one example the thickener may be a calcium sulfonate thickener. In other examples grease may contain a combination of a metal sulfonate thickener and another thickener, such as a metal complex soap grease, detergent, or non-soap thickener. The grease may be formulated to meet specific performance criteria relevant to lubrication of a roller cone drill bit in downhole conditions. The disclosure also relates to a roller cone drill bit containing a grease of the disclosure.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: July 29, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David P. Duckworth, Ping C. Sui, Liwen Wei
  • High Performance Rock Bit Grease
    Publication number: 20130220704
    Abstract: The present disclosure relates to greases containing metal sulfonate thickeners. In one example the thickener may be a calcium sulfonate thickener. In other examples grease may contain a combination of a metal sulfonate thickener and another thickener, such as a metal complex soap grease, detergent, or non-soap thickener. The grease may be formulated to meet specific performance criteria relevant to lubrication of a roller cone drill bit in downhole conditions. The disclosure also relates to a roller cone drill bit containing a grease of the disclosure.
    Type: Application
    Filed: April 5, 2013
    Publication date: August 29, 2013
    Inventors: David P. Duckworth, Ping C. Sui, Liwen Wei
  • HIGH PERFORMANCE ROCK BIT GREASE
    Publication number: 20110048809
    Abstract: The present disclosure relates to greases containing metal sulfonate thickeners. In one example the thickener may be a calcium sulfonate thickener. In other examples grease may contain a combination of a metal sulfonate thickener and another thickener, such as a metal complex soap grease, detergent, or non-soap thickener. The grease may be formulated to meet specific performance criteria relevant to lubrication of a roller cone drill bit in downhole conditions. The disclosure also relates to a roller cone drill bit containing a grease of the disclosure.
    Type: Application
    Filed: January 16, 2009
    Publication date: March 3, 2011
    Inventors: David P. Duckworth, Ping C. Sui, Liwen Wei