Patents by Inventor Le-Khac Bi

Le-Khac Bi 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).

  • N,N-Dimethylacrylamide/2-acrylamido-2-methylpropane sulfonic acid copolymers for enhanced petroleum recovery
    Patent number: 4404111
    Abstract: A N,N-dimethylacrylamide/2-acrylamido-2-methylpropane sulfonic acid copolymer is disclosed. The copolymer is particularly suitable for use as a viscosity control agent in an aqueous composition employed to facilitate petroleum recovery from subterranean petroleum bearing formations.
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: September 13, 1983
    Assignee: Atlantic Richfield Company
    Inventors: Le-Khac Bi, Mary E. Dillon, Clyde Sharik
  • Diolefin monomer purification process for anionic polymerization
    Patent number: 4387264
    Abstract: An improved process for the purification of diolefin monomers for anionic polymerization is disclosed. The purification process of this invention results in polymer which exhibits excellent chain growing.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: June 7, 1983
    Assignee: Atlantic Richfield Company
    Inventor: Le-Khac Bi
  • Copolymers having a backbone of alternating polymer blocks and silicon units
    Patent number: 4371670
    Abstract: Copolymers having a backbone of alternating polymer block and silicon units are described. The copolymers exhibit fire retardant properties.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: February 1, 1983
    Assignee: Atlantic Richfield Company
    Inventor: Le-Khac Bi
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4346198
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having monomodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: August 24, 1982
    Assignee: Atlantic Richfield Company
    Inventors: Kenneth Doak, Le-Khac Bi, Ralph Milkovich
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4248984
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C., and having bimodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: February 3, 1981
    Assignee: ARCO Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich, Kenneth W. Doak
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4248980
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having monomodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: February 3, 1981
    Assignee: ARCO Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4248981
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having trimodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: February 3, 1981
    Assignee: ARCO Polymers, Inc.
    Inventors: Ralph Milkovich, Kenneth Doak, Le-Khac Bi
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4248983
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C. is described.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: February 3, 1981
    Assignee: ARCO Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich, Kenneth W. Doak
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4248982
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having trimodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: February 3, 1981
    Assignee: Arco Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4221884
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C., and having bimodal distribution of molecular structure in the arms of the block copolymer is described.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: September 9, 1980
    Assignee: Arco Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich
  • Clear impact resistant thermoplastic star-block copolymers
    Patent number: 4180530
    Abstract: The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C. is described.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: December 25, 1979
    Assignee: ARCO Polymers, Inc.
    Inventors: Le-Khac Bi, Ralph Milkovich
  • Star polymers and process for the preparation thereof
    Patent number: 4108945
    Abstract: Disclosed is a series of star polymer products having at least three polymeric arms which radiate from a nucleus having at least two molecules of a linking compound. The polymeric arms may be copolymers of conjugated dienes and monovinyl aromatic compounds and/or homopolymers of either monomer. A novel process for the preparation of the polymer products includes the steps of forming the polymeric arms with an organometallic initiator to form polymers terminated by an active chain end and thereafter forming a nucleus with the simultaneous linking of the active chain ends thereto. The nucleus is formed from at least two molecules of a linking compound each having at least two functional groups.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: August 22, 1978
    Assignee: The University of Akron
    Inventors: Lewis J. Fetters, Le-Khac Bi
  • Star polymers and process for the preparation thereof
    Patent number: 3985830
    Abstract: Disclosed is a series of star polymer products having at least three polymeric arms which radiate from a nucleus having at least two molecules of a linking compound. The polymeric arms may be copolymers of conjugated dienes and monovinyl aromatic compounds and/or homopolymers of either monomer. A novel process for the preparation of the polymer products includes the steps of forming the polymer arms with an organometallic initiator to form polymers terminated by an active chain end and thereafter forming a nucleus with the simultaneous linking of the active chain ends thereto. The nucleus is formed from at least two molecules of a linking compound each having at least two functional groups.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: October 12, 1976
    Assignee: The University of Akron
    Inventors: Lewis J. Fetters, Le-Khac Bi