Patents by Inventor John N. Gitua

John N. Gitua 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).

  • Catalyst systems for the polymerization of olefins and the stereoregular polymerization of alpha-olefins via metallacyclic intermediates
    Patent number: 6743872
    Abstract: A novel family of olefin polymerization catalysts comprising three-membered titanacarbocycles is described and illustrated. The titanacarbocycles can be readily synthesized by utilizing di-n-butyltitanium dichloride or di-t-butyltitanium dichloride at −78° C. in alkane, cycloalkane, or aromatic hydrocarbon media. These catalysts exhibit sufficient stability after their preparation that they undergo a remarkable, unprecedented reaction whereby the titanium dichloride moiety is efficiently transferred to a substrate like diphenylacetylene, ethylene, or similar compounds in order to generate the three-membered titanacarbocycles.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: June 1, 2004
    Assignee: The Research Foundation of the State University of New York
    Inventors: John J. Eisch, John N. Gitua