Patents by Inventor Shian S. Wang

Shian S. Wang 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).

  • Acetal copolymers with backbone epoxide functional groups
    Patent number: 5034499
    Abstract: Acetal copolymers of trioxane with epoxy functional groups are obtained by copolymerizing trioxane with 5,6-epoxy-1,3-dioxepane. The epoxide group in the polymer chain provides a highly reacting functional group for further modification. Acetal copolymers with backbone epoxide groups exhibit toughness and thermal stability. The backbone epoxide groups can also be aminated in a one step hydrolysis-amination process.
    Type: Grant
    Filed: April 13, 1988
    Date of Patent: July 23, 1991
    Assignee: Hoechst Celanese Corp.
    Inventors: Nan-Loh Yang, Andrew Auerbach, James L. Paul, Yong C. Zheng, Shian S. Wang
  • Acetal copolymers with backbone bromo functional groups
    Patent number: 4906728
    Abstract: The invention concerns a method for producing an acetal copolymer containing backbone bromo-functional groups comprising copolymerizing trioxane with 5,6,-dibromo-1,3-dioxepene. The invention also concerns methods of modifying acetal copolymers containing bromo-functional groups and the copolymers produced by the methods of the invention.
    Type: Grant
    Filed: April 13, 1988
    Date of Patent: March 6, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Nan-Loh Yang, Andrew Auerbach, James L. Paul, Rose Pesce, Shian S. Wang
  • Acetal copolymers with backbone double bonds and graft copolymers thereof
    Patent number: 4900783
    Abstract: Acetal copolymers of trioxane and 1,3-dioxep-5-ene having a high degree of crystallinity and specific mole percent incorporations of 1,3-dioxep-5-ene are synthesized.The invention also provides a process for producing highly crystalline acetal copolymers by copolymerizing triozane and 1,3-dioxep-5-ene and precipitating the copolymer product from solution.The copolymers show much improved stability against halogen degradation.
    Type: Grant
    Filed: April 13, 1988
    Date of Patent: February 13, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Nan-Loh Yang, Andrew Auerbach, James L. Paul, Rose Pesce, Shian S. Wang