Patents by Inventor Willy Bitsch

Willy Bitsch 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).

  • Patent number: 4665104
    Abstract: A foamed polymethacrylimide resin having improved creep resistance at high temperature and reduced moisture absorption is obtained by heating a foamable resin composition consisting of (1) a copolymer formed between 47 to 53 percent by weight of methacrylonitrile monomer, 53 to 47 percent by weight of methacrylic acid monomer, and 0.01 to 4 percent, by weight of said monomers, of a metal salt of acrylic or methacrylic acid, and (2) 0.5 to 4 percent, also by weight of the monomers, of a blowing agent mixture of formamide or monomethyl formamide and a monohydric aliphatic alcohol having from 3 to 8 carbon atoms in the molecule.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: May 12, 1987
    Assignee: Rohm GmbH
    Inventor: Willy Bitsch