Patents by Inventor Thai H. Duong

Thai H. Duong 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).

  • Method of and composition for breaking oil and water emulsions in crude oil processing operations
    Patent number: 5851433
    Abstract: Methods and compositions for breaking oil and water emulsions are disclosed. Oil and water emulsions are broken by treating the emulsion with a copolymer of tannin and a cationic monomer. The preferred composition is an aqueous solution of a copolymer of tannin and a cationic monomer, a water soluble organic multivalent salt and a glycol. The preferred salt is aluminum chlorohydrate and the preferred glycol is hexylene glycol.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: December 22, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Paul R. Hart, Jen-Chi Chen, Fu Chen, Thai H. Duong
  • Method of and composition for breaking oil and water emulsions in crude oil processing operations
    Patent number: 5693216
    Abstract: Methods and compositions for breaking oil and water emulsions are disclosed. Oil and water emulsions are broken by treating the emulsion with a copolymer of tannin and a cationic monomer. The preferred composition is an aqueous solution of a copolymer of tannin and a cationic monomer, a water soluble organic multivalent salt and a glycol. The preferred salt is aluminum chlorohydrate and the preferred glycol is hexylene glycol.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: December 2, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Paul R. Hart, Jen-Chi Chen, Fu Chen, Thai H. Duong