Patents by Inventor David E. Zak

David E. Zak 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).

  • Iron-based catalyst composition for the manufacture of syndiotactic 1, 2-polybutadiene
    Patent number: 6610804
    Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an iron-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: August 26, 2003
    Assignee: Bridgestone Corporation
    Inventors: Steven Luo, David E. Zak
  • Iron-based catalyst for producing high-vinyl polybutadiene
    Patent number: 6576725
    Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising an iron-containing compound, an organomagnesium compound, and an &agr;-acylphosphonate diester.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: June 10, 2003
    Assignee: Bridgestone Corporation
    Inventors: Steven Luo, Michael W. Hayes, Dennis R. Brumbaugh, David E. Zak
  • Iron-based catalyst composition for the manufacture of syndiotactic 1, 2-polybutadiene
    Publication number: 20030073790
    Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an iron-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 17, 2003
    Applicant: Bridgestone Corp.
    Inventors: Steven Luo, David E. Zak
  • Method of preparing oligomers of conjugated dienes with an iron-based catalyst composition
    Publication number: 20030073570
    Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) (i) a halogen-containing iron compound or (ii) an iron-containing compound and a halogen-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.
    Type: Application
    Filed: October 12, 2001
    Publication date: April 17, 2003
    Applicant: Bridgestone Corp.
    Inventors: Steven Luo, David E. Zak