Patents by Inventor Meei-Hwa Wang

Meei-Hwa 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).

  • Groups IIA and IIIA based catalyst composition for preparing high-syndiotacticity polystyrene
    Patent number: 6211106
    Abstract: A catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR′1R′2R′3R′4 or TiR′1R′2R′3, wherein R′1, R′2, R′3, and R′4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex represented by the following formula: wherein R1-R13 are, independently, alkyl group, aryl group, silyl group, halogen atom, or hydrogen atom; Ra and Rb are, independently, alkyl group, aryl group, alkoxy, aryloxy group, cyclopentadienyl group, hydrogen atom, or halogen atom; and Xa is a Group IIA element and Xb is a Group IIIA element.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: April 3, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: Jing-Cherng Tsai, Yi-Chun Chen, Sheng Te Yang, Meei-Hwa Wang, Shian-Jy Wang