Patents by Inventor Herbert H. Gahmig

Herbert H. Gahmig 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).

  • Method of making expandable polystyrene beads
    Patent number: 4174427
    Abstract: Expandable-polystyrene beads suitable for use in making impervious containers are made from a recipe including styrene, free-radical initiator and polyvinyl pyrrolidone, and this practice includes a step of washing the beads in a warm aqueous solution to which an alkoxylated nonionic surfactant having 70-90 percent of its molecular weight accounted for by oxyethylene units is added in an amount effective to cause the washing to remove contaminating grafted polyvinyl pyrrolidone from the surface of the beads and cause them to become expandable into impervious product containers.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: November 13, 1979
    Assignee: BASF Wyandotte Corporation
    Inventors: Pauls Davis, Herbert H. Gahmig, Irving R. Schmolka