Patents by Inventor Alfonso Grassi

Alfonso Grassi 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).

  • Styrene-butadiene block copolymer
    Patent number: 6271313
    Abstract: This invention is based upon the unexpected discovery that styrene-butadiene block copolymers having syndiotactic polystyrene (sPS) blocks and cis-1,4-polybutadiene (PBd) blocks can be synthesized by polymerizing styrene and 1,3-butadiene utilizing certain catalyst systems when the polymerization is conducted at a pressure which is within the range of about 10 mm of mercury to about 50 mm of mercury at a temperature which is within the range of about 0° C. to about 100° C.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: August 7, 2001
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adolfo Zambelli, Alfonso Grassi, Michela Caprio, Daniel Edward Bowen, III