Patents by Inventor Walter Manfred

Walter Manfred 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 polymers containing blowing agents
    Patent number: 4772441
    Abstract: Particulate styrene polymers containing blowing agents are prepared by a process in which an aliphatic hydrocarbon of 7 to 9 carbon atoms is added in an amount of from 0.01 to 0.5% by weight, based on the styrene polymer, before, during or after the polymerization. The particulate styrene polymers can be processed to foam blocks and moldings having a satisfactory smooth surface.
    Type: Grant
    Filed: June 19, 1987
    Date of Patent: September 20, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Harro Voss, Klaus Hahn, Walter Manfred, Isidoor DeGrave