Patents by Inventor Julie Elward-Berry

Julie Elward-Berry 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).

  • Thermally stable hydrophobically associating rheological control additives for water-based drilling fluids
    Patent number: 5096603
    Abstract: A water soluble polymer which is characterized by the formula: ##STR1## wherein x is 50 mole percent or 662/3 mole percent or 75 mole percent and y+z is 50 mole percent, when x is 50 mole percent, y+z is 331/3 mole percent, when x is 662/3 mole percent, and y+z is 25 mole percent, when x is 75 mole percent, wherein the molar ratio of y to z is about 100:1 to 1:100, and M.sup.+ is hydrogen or a metal cation selected from the group consisting of lead, aluminum, iron and Groups IA, IIA, IB and IIB of the Periodic Table of Elements and the level of sulfonation based upon the styrene monomer is about 75 to about 100 mole percent, and R is an alkyl group having about 6 to about 22 carbon atoms.
    Type: Grant
    Filed: August 8, 1990
    Date of Patent: March 17, 1992
    Assignee: Exxon Research and Engineering Company
    Inventors: Dennis G. Peiffer, Jan Bock, Julie Elward-Berry
  • Zwitterionic functionalized polymers as deflocculants in water based drilling fluids
    Patent number: 5026490
    Abstract: A water soluble polymer which is characterized by the formula: ##STR1## wherein x is 50 mole percent or 662/3 mole percent or 75 mole percent and y+z is 50 mole percent, when x is 50 mole percent, y+z is 331/3 mole percent, when x is 662/3 mole percent, and y+z is 25 mole percent, when x is 75 mole percent, wherein the molar ratio of y to z is about 100:1 to 1:100, and M.sup.+ is hydrogen or a metal cation selected from the group consisting of lead, aluminum, iron and Groups IA, IIA, IB and IIB of the Periodic Table of Elements and the level of sulfonation based upon the styrene monomer is about 75 to about 100 mole percent.
    Type: Grant
    Filed: August 8, 1990
    Date of Patent: June 25, 1991
    Assignee: Exxon Research & Engineering
    Inventors: Dennis G. Peiffer, Jan Bock, Julie Elward-Berry