Patents by Inventor Wolfgang Roth-Greiner

Wolfgang Roth-Greiner 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).

  • Redispersible powder compositions for preparing photographic recording materials
    Patent number: 5922789
    Abstract: The invention is a ready-to-use, water-redispersible powder composition useful for preparing photographic recording materials or inkjet recording materials, which comprises a mixture containing polymers made from ethylenically unsaturated monomers and gelatin, wherein the polymers are prepared by emulsion polymerization in the presence of at least one emulsifier selected from emulsifiers with ionic and nonionic groups and if exclusively ionic emulsifiers are used, the copolymerization is carried out in the presence of comonomers which contain one or more groups selected from --COOH, --OH, SO.sub.3.sup.-, NCH.sub.2 OH and --C.dbd.O.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: July 13, 1999
    Assignee: Wacker-Chemie GmbH
    Inventors: Klaus Kohlhammer, Wolfgang Roth-Greiner, Reiner Figge, Reinhard Haerzschel