Patents by Inventor Thomas C. Shen

Thomas C. Shen 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).

  • Highly crosslinked silicon polymers for gas chromatography columns
    Patent number: 5360878
    Abstract: A new highly crosslinked silicone polymer particle for gas chromatography application and a process for synthesizing such copolymer. The new copolymer comprises vinyltriethoxysilane and octadecyltrichlorosilane. The copolymer has a high degree of crosslinking and a cool balance of polar to nonpolar sites in the porous silicon polymer assuring fast separation of compounds of variable polarity.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: November 1, 1994
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Thomas C. Shen
  • Polymerizable quaternary ammonium methyl carbonates
    Patent number: 4973639
    Abstract: In one embodiment this invention provides a novel polymerizable quaternary ammonium carbonate corresponding to the formula: ##STR1## In another embodiment this invention provides a novel copolymer of the above represented methacrylamidopropyltrimethylammonium methyl carbonate and acrylamide, which exhibits a high level clay flocculation efficiency.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: November 27, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas C. Shen, James H. Rea
  • Polymerizable quaternary ammonium methyl carbonates
    Patent number: 4910325
    Abstract: In one embodiment this invention provides a novel polymerizable quaternary ammonium carbonate corresponding to the formula: ##STR1## In another embodiment this invention provides a novel copolymer of the above represented methacrylamidopropyltrimethylammonium methyl carbonate and acrylamide, which exhibits a high level clay flocculation efficiency.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: March 20, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas C. Shen, James H. Rea