Patents by Inventor Jia-Chu Liu

Jia-Chu Liu 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).

  • Ethylene polymerization process
    Patent number: 6255415
    Abstract: A gas phase copolymerization of ethylene is disclosed. The process uses a supported single-site catalyst that contains a heteroatomic ligand and produces polyethylene that has a reduced density. Suitable heteroatomic ligands include boraaryl, azaborolinyl, pyridinyl, pyrrolyl, indolyl, carbazolyl and quinolinyl.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: July 3, 2001
    Assignee: Equistar Chemicals, L.P.
    Inventors: Shaotian Wang, Jia-Chu Liu, Mark P. Mack, Clifford C. Lee
  • Quinolinoxy and pyridinoxy single-site catalysts containing benzyl ligands
    Patent number: 6239239
    Abstract: An improved catalyst for polymerizing olefins is disclosed. The catalyst comprises a Group 4 transition metal, at least one quinolinoxy or pyridinoxy ligand, and at least one benzyl ligand. Particularly when used with an activator, the benzyl-containing catalysts have exceptional activities for polymerizing olefins.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: May 29, 2001
    Assignee: Equistar Chemicals, L.P.
    Inventor: Jia-Chu Liu