Patents by Inventor Guangcai Bai

Guangcai Bai 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).

  • Oxygen-bridged bimetallic complex, the production thereof and its utilization for polymerization catalysis
    Patent number: 7645716
    Abstract: The novel binuclear, oxygen-bridged, bimetallic complexes of the general formula (I): [(LM1R1)(Cp2M2R2)](?-O)??(I) are suitable as polymerization catalysts for olefin polymerization. (M1=Al, Ge, Zr or Ti; M2=Zr, Ti or Hf; Cp=cyclopentadienyl; R1, R2=methyl, ethyl, i-propyl, t-butyl, halogen, phenyl, alkylphenyl, SiMe3; L=a bidentate, doubly heteroatom-coordinated organic chemical ligand, which together with the metal M1 forms a 5 or 6-membered ring.) They display very good catalytic activities, good operating lives, and require little cocatalyst.
    Type: Grant
    Filed: March 15, 2005
    Date of Patent: January 12, 2010
    Assignee: Georg-August-Universitaet Goettingen
    Inventors: Herbert Roesky, Guangcai Bai, Vojtech Janicik, Sanjay Singh
  • Oxygen-Bridged Bimetallic Complex, the Production Thereof and Its Utilization for Polymerization Catalysis
    Publication number: 20080261804
    Abstract: The binoclear, oxygen-bridged, hetero-bimetallic complexes of general formula [(LM1R3)(Cp2M2R2)]?-O) are suitable as polymerization catalysts for olefin polymerization. (M1=Al, Ge, Zr or Ti; M2=Zr, Ti or Hf; Cp=cyclopentadienyl; R1, R2=methyl, ethyl, i-propyl, t-butyl, halogen, phenyl, alkylphenyl, SiMc3; L=bidental, doubly nitrogen-coordinated organochemical ligand, which together with metal M1 form a 5- or six membered ring). These complexes have very good catalytic activity, good useful life and require less cocatalysts.
    Type: Application
    Filed: March 15, 2005
    Publication date: October 23, 2008
    Inventors: Herbert Roesky, Guangcai Bai, Vojtech Janicik, Sanjay Singh