Patents by Inventor Lau S. Yang

Lau S. Yang 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).

  • Patent number: 5436314
    Abstract: A process for making polyetheresters is disclosed. A polyether is reacted with a carboxylic acid in the presence of a strong protic acid or a metal salt of a strong protic acid to promote insertion of the carboxylic acid into polyether carbon-oxygen bonds to produce a polyetherester. The polyetheresters are useful for various applications in the polyurethane and unsaturated polyester industries.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: July 25, 1995
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Lau S. Yang, Jeffrey A. Klang
  • Patent number: 5436313
    Abstract: An improved process for making polyetheresters is disclosed. A polyether is reacted with an anhydride in the presence of a strong protic acid or a metal salt of a strong protic acid in an amount effective to promote insertion of the anhydride into carbon-oxygen bonds of the polyether to produce the polyetherester. Polyetheresters made by the process of the invention are useful in a wide variety of applications, particularly in the polyurethane and unsaturated polyester industries.
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: July 25, 1995
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Jeffrey A. Klang, Lau S. Yang
  • Patent number: 5319006
    Abstract: Polyesters are prepared by a new ester-insertion reaction of a polyether and a cyclic anhydride in the presence of a Lewis acid catalyst. The process is advantageously used to convert polyether polyols recovered from polyurethanes into curable unsaturated polyester resins.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: June 7, 1994
    Assignee: Arco Chemical Technology, L.P.
    Inventors: Lau S. Yang, Diane A. Macarevich
  • Patent number: 5254723
    Abstract: A process for making glycol diesters from polyethers is disclosed. The polyether is reacted with an acyclic, aliphatic anhydride in the presence of a Lewis acid to produce the glycol diester. The invention provides a way to reuse polyether polyols recovered from polyurethanes by converting them to readily purified glycol diesters. The diesters are useful as solvents and as chemical intermediates.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: October 19, 1993
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Lau S. Yang, Diane A. Macarevich
  • Patent number: 5208379
    Abstract: Waste or scrap polyurethane may be conveniently and economically converted to useful active-hydrogen containing polyethers and polyamines by contacting the polyurethane with water, strong base, and an activating agent such as a quaternary ammonium compound containing at least 15 carbon atoms or an organic sulfonate containing at least 7 carbon atoms. The activating agent helps to accelerate the rate of base catalyzed hydrolysis.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: May 4, 1993
    Assignee: Arco Chemical Technology, L.P.
    Inventors: Lau S. Yang, Diane A. Macarevich
  • Patent number: 5151464
    Abstract: Miscible polyblends of acid-containing and anhydride-containing styrenic copolymers are described. In a preferred embodiment, the polyblend contains a styrene/maleic anhydride copolymer and a styrene/methacrylic acid copolymer.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: September 29, 1992
    Assignee: Arco Chemical Technology, L.P.
    Inventor: Lau S. Yang
  • Patent number: 4950467
    Abstract: Sunscreen compositions are described which contain certain 5-phenylpentadienoate esters which act as UV filters when incorporated in a carrier in amounts ranging from 0.1-50% by weight.
    Type: Grant
    Filed: November 14, 1986
    Date of Patent: August 21, 1990
    Assignee: ICI Americas Inc.
    Inventors: Charalambos J. Phalangas, Alfred J. Restaino, Lau S. Yang
  • Patent number: 4250088
    Abstract: Lignin compounds are demethylated without degradation of the lignin polymer backbone to provide a highly reactive lignin and methyl chloride as products. The reaction is applicable to Kraft lignin or lignosulfonates derived from spent sulfite liquor. Demethylation is accomplished by reacting the lignin material at an elevated temperature with an amine hydrohalide salt.
    Type: Grant
    Filed: August 20, 1979
    Date of Patent: February 10, 1981
    Assignee: American Can Company
    Inventor: Lau S. Yang