Patents by Inventor Diane M. Smith

Diane M. Smith 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).

  • Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
    Patent number: 6656885
    Abstract: The invention provides an organic diacid anhydride-modified chitosan containing a polar additive comprising water soluble compounds containing one or more hydroxyl groups or one or more amino groups, including compounds containing both hydroxyl and amine groups, having a molecular weight less than about 2000, preferably less than about 1000. The invention also provides fluids useful in various well drilling and servicing operations comprising an alkaline aqueous liquid containing an organic diacid anhydride, chitosan, and the polar additive therein, as well as a method of drilling wells therewith.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: December 2, 2003
    Assignee: Venture Innovations, Inc.
    Inventors: Roy F. House, Diane M. Smith
  • Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
    Publication number: 20020098987
    Abstract: The invention provides an organic diacid anhydride-modified chitosan containing a polar additive comprising water soluble compounds containing one or more hydroxyl groups or one or more amino groups, including compounds containing both hydroxyl and amine groups, having a molecular weight less than about 2000, preferably less than about 1000. The invention also provides fluids useful in various well drilling and servicing operations comprising an alkaline aqueous liquid containing an organic diacid anhydride, chitosan, and the polar additive therein, as well as a method of drilling wells therewith.
    Type: Application
    Filed: January 3, 2002
    Publication date: July 25, 2002
    Inventors: Roy F. House, Diane M. Smith