Patents by Inventor Wei-Tech W. Shang

Wei-Tech W. Shang 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).

  • Aromatic sulfide/sulfone polymer production
    Patent number: 4958004
    Abstract: A process is provided for the production of aromatic sulfide/sulfone polymers which involves contacting under suitable polymerization reaction conditions: (1) at least one dihaloaromatic sulfone, (2) at least one organic amide, (3) at least one alkali metal hydrosulfide, (4) water, and (5) at least one member selected from the group consisting of (a) alkali metal carbonates and (b) mixtures of alkali metal carbonates with alkali metal hydroxides wherein said mixtures have at least about 0.5 mole percent alkali metal carbonate.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: September 18, 1990
    Assignee: Phillips Petroleum Company
    Inventors: Kenneth C. Hoover, Lacey E. Scoggins, Wei-Tech W. Shang, Afif M. Nesheiwat