Patents by Inventor Heinrich Wirth

Heinrich Wirth 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).

  • Particulate expandable styrene polymers for the manufacture of foams
    Patent number: 4086191
    Abstract: Particulate expandable styrene polymers which contain from 0.0001 to 0.2% by weight, based on the styrene polymer, of an inhomogeneously distributed nucleating agent for expandable polystyrene, the nucleating agent being present only in a peripheral zone of the particles while the interior of the particles is free from nucleating agent. Nucleating agents which may be used are organic compounds having at least three bromine atoms, bonded to aliphatic or cycloaliphatic structures, in the molecule, or bromine compounds which are polymerizable, or are copolymerizable with styrene.
    Type: Grant
    Filed: October 2, 1975
    Date of Patent: April 25, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Hinselmann, Klaus Penzien, Rupert Schick, Manfred Walter, Heinz Weber, Heinrich Wirth