Patents by Inventor Gary A. Tolhurst

Gary A. Tolhurst 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).

  • Flexibilized polyurethane pipe coating
    Patent number: 4542049
    Abstract: Disclosed is a coating composition suitable for coating metal pipe, especially the interior of pipe. The coating composition comprises a blend of one or more polyether polyols and a flexibilizing stearically hindered amine-initiated polyether polyol and a multi-isocyanate curing agent. The curing composition optionally may contain an organic solvent and inert particulate filler. The coating composition cures within about 1 to 3 minutes after application and preferably is spray applied. The coating composition possesses adequate flexibility to pass a 15% ring deflection test.
    Type: Grant
    Filed: August 28, 1984
    Date of Patent: September 17, 1985
    Assignee: Ashland Oil, Inc.
    Inventors: Gary A. Tolhurst, Albert L. Haugse
  • Furan binder composition
    Patent number: 4215206
    Abstract: Furan resin compositions containing aromatic polyester polyols exhibit improved performance as foundry hot box binders.
    Type: Grant
    Filed: March 16, 1978
    Date of Patent: July 29, 1980
    Assignee: Ashland Oil, Inc.
    Inventors: Richard F. Hanesworth, Young D. Kim, Gary A. Tolhurst