Patents by Inventor Andrew Hen Liu

Andrew Hen Liu 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: 8975348
    Abstract: A solvent-based non-aqueous fluorinated methacrylate polymer comprising repeating units in any sequence from (1) at least one fluorinated methacrylate, and (2) at least one non-fluorinated alkyl acrylate and (3) at least one non-fluorinated hydroxyalkyl methacrylate, provided that a) the repeating unit of fluorinated methacrylate is present in a range of about 40%-80% by weight of total monomers added, b) the repeating unit of non-fluorinated alkyl acrylate is present in a range of about 10%-35% by weight of total monomers added, and c) the repeating unit of non-fluorinated hydroxyalkyl methacrylate is present in a range of about 5%-25% by weight of total monomers added, and d) the total of all repeating units is 100% by weight.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: March 10, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Michael Henry Ober, Ernest Byron Wysong, Timothy Edward Hopkins, Andrew Hen Liu
  • Publication number: 20110200829
    Abstract: A solvent-based non-aqueous fluorinated methacrylate polymer comprising repeating units in any sequence from (1) at least one fluorinated methacrylate, and (2) at least one non-fluorinated alkyl acrylate and (3) at least one non-fluorinated hydroxyalkyl methacrylate, provided that a) the repeating unit of fluorinated methacrylate is present in a range of about 40%-80% by weight of total monomers added, b) the repeating unit of non-fluorinated alkyl acrylate is present in a range of about 10%-35% by weight of total monomers added, and c) the repeating unit of non-fluorinated hydroxyalkyl methacrylate is present in a range of about 5%-25% by weight of total monomers added, and d) the total of all repeating units is 100% by weight.
    Type: Application
    Filed: January 21, 2011
    Publication date: August 18, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Michael Henry Ober, Ernest Byron Wysong, Timothy Edward Hopkins, Andrew Hen Liu
  • Patent number: 7592064
    Abstract: Carpet protectants comprising an aqueous dispersion comprising A. a partially fluorinated urethane polymer having at least one urea linkage, which compound is the product of the reaction of: (1) at least one organic polyisocyanate containing at least three isocyanate groups; (2) at least one fluorochemical compound which contains per molecule (a) a single functional group having one or more Zerewitinoff hydrogen atoms and (b) at least two carbon atoms, each of which is attached to at least two fluorine atoms; and (3) water in an amount sufficient to react with from about 5% to about 60% of the isocyanate groups in said polyisocyanate; B. a non-fluorinated cationic surfactant; and C. a non-fluorinated nonionic surfactant are disclosed.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: September 22, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Patrick Henry Fitzgerald, Andrew Hen Liu, Peter Michael Murphy, Charles L. Strickler
  • Publication number: 20080196168
    Abstract: A washable leather having durable oil repellency, durable stain release, and durable water repellency is disclosed and a method of its preparation comprising contacting the leather during tanning with a composition which comprises at least one fluorinated urethane; at least one fluorinated ester; a mixture thereof; or a mixture of at least one fluorinated citrate urethane with at least one fluorinated urethane, at least one fluorinated ester, or a mixture of fluorinated urethane and fluorinated ester.
    Type: Application
    Filed: March 3, 2008
    Publication date: August 21, 2008
    Applicant: E.I. du Pont de Nemours and Company
    Inventors: Kai Volker Schubert, Andrew Hen Liu, Hansjoerg Scheen
  • Patent number: 7160480
    Abstract: A method of treating leather for imparting soil resistance to the leather by contacting the leather with a fluorinated hydrophobic additive comprising at least one fluorinated urethane or a mixture of at least one fluorinated urethane with at least one fluorinated ester, and the resulting treated leather having soil resistance are disclosed.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: January 9, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Andrew Hen Liu, Kai-Volker Schubert
  • Patent number: 6790905
    Abstract: Carpet protectants comprising an aqueous dispersion comprising A. a partially fluorinated urethane polymer having at least one urea linkage, which compound is the product of the reaction of: (1) at least one organic polyisocyanate containing at least three isocyanate groups; (2) at least one fluorochemical compound which contains per molecule (a) a single functional group having one or more Zerewitinoff hydrogen atoms and (b) at least two carbon atoms, each of which is attached to at least two fluorine atoms; and (3) water in an amount sufficient to react with from about 5% to about 60% of the isocyanate groups in said polyisocyanate; B. a non-fluorinated cationic surfactant; and C. a non-fluorinated nonionic surfactant are disclosed.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: September 14, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Patrick Henry Fitzgerald, Andrew Hen Liu, Peter Michael Murphy, Charles L. Strickler
  • Publication number: 20030157296
    Abstract: Carpet protectants comprising an aqueous dispersion comprising
    Type: Application
    Filed: October 9, 2001
    Publication date: August 21, 2003
    Inventors: Patrick Henry Fitzgerald, Andrew Hen Liu, Peter Michael Murphy, Charles L. Strickler