Patents by Inventor Li-Ying T. Yang

Li-Ying T. 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).

  • Chemically embossed metallocene polyethylene foam
    Patent number: 6187840
    Abstract: A textured metallocene polyethylene foam sheet suitable for use in a floor covering is made using a highly co-activated azodicarbonamide package which blows the metallocene polyethylene effectively. The preferred co-activators are zinc oxide and urea. The textured surface of metallocene polyethylene foam is formed by a chemical embossing process which utilizes a liquid triazole having an alkyl moiety as a foam-expansion inhibitor. The triazole is dissolved in a non-polar solvent to form the foam inhibitor. The preferred inhibitor is a hydrocarbon which may be halogenated.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: February 13, 2001
    Assignee: Armstrong World Industries, Inc.
    Inventors: Li-Ying T. Yang, Martin Dees
  • Chemically embossed metallocene polyethylene foam
    Patent number: 6140379
    Abstract: A textured metallocene polyethylene foam sheet suitable for use in a floor covering is made using a highly co-activated azodicarbonamide package which blows the metallocene polyethylene effectively. The preferred co-activators are zinc oxide and urea. The textured surface of metallocene polyethylene foam is formed by a chemical embossing process which utilizes a liquid triazole having an alkyl moiety as a foam-expansion inhibitor. The triazole is dissolved in a non-polar solvent to form the foam inhibitor. The preferred inhibitor is a hydrocarbon which may be halogenated.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: October 31, 2000
    Assignee: Armstrong World Industries, Inc.
    Inventors: Li-Ying T. Yang, Martin Dees