Patents by Inventor Guy James Lefort

Guy James Lefort 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).

  • Roller cone bit with improved seal gland design
    Patent number: 6752223
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: June 22, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort
  • Roller cone bit with improved seal gland design
    Publication number: 20020027326
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Application
    Filed: August 28, 2001
    Publication date: March 7, 2002
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort
  • Roller cone bit with improved seal gland design
    Patent number: 6279671
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: August 28, 2001
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort