Patents by Inventor David M. Dawson

David M. Dawson 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).

  • Process for the production of polyisoolefins by means of novel metallocene type initiator systems
    Patent number: 5703182
    Abstract: Polyisoolefins are produced using the process according to the invention by polymerising isoolefins, optionally with conjugated or unconjugated dienes and/or cationically polymerisable, mono- or polyunsaturated compounds in solution, in suspension or in the gas phase at temperatures of -100.degree. C. to +200.degree. C. and pressures of 0.1 to 100 bar in the presence of an initiator system consisting of aluminium-cyclopentadienyl compounds and boron compounds.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: December 30, 1997
    Assignee: Bayer AG
    Inventors: Gerhard Langstein, Manfred Bochmann, David M. Dawson