Patents by Inventor Patricia C. Matthews

Patricia C. Matthews 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).

  • Additive composition for release of stuck drill pipe
    Patent number: 4464269
    Abstract: An additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains propoxylated C.sub.18 -C.sub.32 alkanols, an oil-soluble emulsifier-wetting agent and a liquid hydrocarbon diluent and for enhanced elevated temperature emulsion stability may include an imidazoline.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: August 7, 1984
    Assignee: Exxon Research & Engineering Co.
    Inventors: Thad O. Walker, Patricia C. Matthews
  • Additive composition for release of stuck drill pipe
    Patent number: 4436638
    Abstract: An additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains propoxylated C.sub.18 -C.sub.32 alkanols, an oil-soluble emulsifier-wetting agent and a liquid hydrocarbon diluent.
    Type: Grant
    Filed: July 29, 1981
    Date of Patent: March 13, 1984
    Assignee: Exxon Research & Engineering Co.
    Inventors: Thad O. Walker, Patricia C. Matthews
  • Additive composition for release of stuck drill pipe
    Patent number: 4427564
    Abstract: An additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains a propoxylated lactone acid, e.g. a C.sub.8 -C.sub.22 alkyl lactone acids having from 10 to 13 propylene glycol units, an oil-soluble emulsifier-wetting agent and a liquid hydrocarbon diluent and for enhanced elevated temperature emulsion stability may include an imidazoline.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: January 24, 1984
    Assignee: Exxon Research & Engineering Co.
    Inventors: Darrell W. Brownawell, Antonio Gutierrez, Patricia C. Matthews, Thad O. Walker