Patents by Inventor David A. Strah

David A. Strah 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).

  • Method for inhibiting the initiation and propagation of formation fractures while drilling and casing a well
    Patent number: 5207282
    Abstract: Fracture initiation and propagation during drilling or running casing in a well are prevented or inhibited by including an effective amount of a specially sized solid particulate loss prevention material in the well fluid prior to encountering formation breakdown in a susceptible zone.
    Type: Grant
    Filed: October 5, 1992
    Date of Patent: May 4, 1993
    Assignee: Conoco Inc.
    Inventors: Giin-Fa Fuh, Nobuo Morita, Donald L. Whitfill, David A. Strah
  • Method for inhibiting the initiation and propagation of formation fractures while drilling
    Patent number: 5180020
    Abstract: Fracture initiation and propagation during drilling are prevented or inhibited by including an effective amount of a specially sized solid particulate loss prevention material in the drilling fluid prior to encountering formation breakdown in a susceptible zone.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: January 19, 1993
    Assignee: Conoco Inc.
    Inventors: Giin-Fa Fuh, Nobuo Morita, Donald L. Whitfill, David A. Strah
  • Process for removing methanol from alkylation unit feed stream
    Patent number: 4740632
    Abstract: A process of removing methanol from a mixed stream comprising methanol and at least one hydrocarbon and utilizing the hydrocarbon as feed for an acid catalyzed alkylation unit which produces a spent acid stream is provided. The process is comprised of the steps of contacting the mixed stream with at least a portion of the alkylation unit spent acid stream whereby the methanol is reacted therewith and an aqueous reaction mixture is formed, separating the aqueous reaction mixture from the hydrocarbon and conducting the hydrocarbon to the alkylation unit.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: April 26, 1988
    Assignee: Conoco Inc.
    Inventors: Ardis L. Anderson, David A. Strah