Patents by Inventor Phillip L. Sturla

Phillip L. Sturla 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).

  • Aqueous polysaccharide compositions
    Patent number: 4900457
    Abstract: The invention provides aqueous polysaccharide compositions comprising 0.03 to 5% w/v of a water-soluble polysaccharide, 5 to 80% w/v of at least one salt of at least one mono- or divalent cation, wherein at least 0.05% w/v, based on the composition, of the at least one salt is formate, the balance of the at least one salt, if any, being at least one halide, a process for preparing the compositions, and their use in well-drilling operations.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: February 13, 1990
    Assignee: Shell Oil Company
    Inventors: Anthony J. Clarke-Sturman, Phillip L. Sturla
  • Degradation of a viscous microbial polysaccharide formulation
    Patent number: 4754809
    Abstract: A process for the degradation with acid of a viscous microbial polysaccharide formulation which is applied in oil and/or gas reservoir operations, wherein the polysaccharide formulation contains an amount of a salt or a salt mixture which is sufficient to adjust the transition temperature of the polysaccharide such that it is close to the reservoir operating temperature. A process for the preparation of an acid degradable polysaccharide formulation and a polysaccharide formulation.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: July 5, 1988
    Assignee: Shell Oil Company
    Inventors: Marinus van Zanten, Jeffrey B. Pedley, Phillip L. Sturla