Patents by Inventor H. Paul Francis

H. Paul Francis 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).

  • High temperature drilling fluid component
    Patent number: 4652384
    Abstract: What is disclosed is a cross-linked starch which provides better fluid loss control in well drilling fluids than conventional starches at elevated temperatures. The starch may be derived from any source.
    Type: Grant
    Filed: August 30, 1984
    Date of Patent: March 24, 1987
    Assignee: American Maize-Products Company
    Inventors: H. Paul Francis, Edward D. DeBoer, Vilas L. Wermers