Patents by Inventor Xianyin Ma

Xianyin Ma 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).

  • Partially ester-exchanged SIPM and process therewith
    Patent number: 6706852
    Abstract: A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: March 16, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Jiwen F. Duan, Xianyin Ma
  • PARTIALLY ESTER-EXCHANGED SIPM AND PROCESS THEREWITH
    Publication number: 20040006194
    Abstract: A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.
    Type: Application
    Filed: July 2, 2002
    Publication date: January 8, 2004
    Inventors: Jiwen F. Duan, Xianyin Ma