Patents by Inventor Norman S. Pollard

Norman S. Pollard 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).

  • Well perforating apparatus
    Patent number: 5054564
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: January 18, 1988
    Date of Patent: October 8, 1991
    Assignee: Halliburton Company
    Inventors: Michael L. Oestreich, Norman S. Pollard
  • Well perforating apparatus and method
    Patent number: 4773299
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p) (360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: September 27, 1988
    Assignee: Halliburton Company
    Inventors: Michael L. Oestreich, Norman S. Pollard
  • Well perforating apparatus and method
    Patent number: 4726431
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: February 23, 1988
    Assignee: James R. Duzan
    Inventors: Michael L. Oestreich, Norman S. Pollard