Patents by Inventor Zaiwei Li

Zaiwei Li 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).

  • Patent number: 7615644
    Abstract: Aspects of the present invention relate to compositions and methods for the use of ionic liquids with dissolved metal compounds as catalysts for a variety of chemical reactions. Ionic liquids are salts that generally are liquids at room temperature, and are capable of dissolving a many types of compounds that are relatively insoluble in aqueous or organic solvent systems. Specifically, ionic liquids may dissolve metal compounds to produce homogeneous and heterogeneous organometallic catalysts. One industrially-important chemical reaction that may be catalyzed by metal-containing ionic liquid catalysts is the conversion of methane to methanol.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: November 10, 2009
    Assignee: California Institute of Technology
    Inventors: Zaiwei Li, Yongchun Tang, Jihong Cheng
  • Publication number: 20080214814
    Abstract: Stable ionic liquid complexes capable of maintaining stability at high temperatures, under acidic and highly oxidative conditions in the presence of a transition metal, and methods for determining the stability of stable ionic liquid complexes are provided. In accordance with the disclosure herein, the stable ionic liquid complexes are derived from pyrazole, pyrazine and 1,2,4-triazole.
    Type: Application
    Filed: July 18, 2007
    Publication date: September 4, 2008
    Inventors: Zaiwei Li, Yongchun Tang, Jihong Cheng
  • Publication number: 20060069169
    Abstract: Aspects of the present invention relate to compositions and methods for the use of ionic liquids with dissolved metal compounds as catalysts for a variety of chemical reactions. Ionic liquids are salts that generally are liquids at room temperature, and are capable of dissolving a many types of compounds that are relatively insoluble in aqueous or organic solvent systems. Specifically, ionic liquids may dissolve metal compounds to produce homogeneous and heterogeneous organometallic catalysts. One industrially-important chemical reaction that may be catalyzed by metal-containing ionic liquid catalysts is the conversion of methane to methanol.
    Type: Application
    Filed: September 16, 2005
    Publication date: March 30, 2006
    Applicant: California Institute of Technology
    Inventors: Zaiwei Li, Yongchun Tang, Jihong Cheng