Patents by Inventor Jan-Hilbert Mast

Jan-Hilbert Mast 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).

  • Dyeing leather with water-insoluble sulphur dyes
    Patent number: 5240466
    Abstract: The present invention relates to a process for dyeing leather by the exhaust method, characterized in that water-insoluble sulphur dyes in dispersed form are used.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: August 31, 1993
    Assignee: Casella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Hubert Kruse, Gert Nagl, Jan-Hilbert Mast, Lothar Schlosser
  • Urethanes containing perfluoroalkyl and epichlorohydrin groups
    Patent number: 4709074
    Abstract: The novel urethanes correspond to the formula I below ##STR1## in which a denotes a number from 5 to 17 and b denotes a number from 1 to 7. These urethanes are prepared by reacting the corresponding perfluoroalkylethanol/epichlorohydrin adducts with toluelene diisocyanates. The novel aqueous dispersions are essentially composed of the novel urethanes, cationic or betaine emulsifiers and non-ionic emulsifiers, water-insoluble carboxylic and/or dicarboxylic acid esters and alkanediols or polyalkanediols which can be etherified on one or both sides, in water.The novel urethanes and the novel aqueous dispersions are used to impart an oleophobic and hydrophobic finish to textiles, leather and furs. They are also suitable for the treatment of unpainted timber, for example unpainted furniture.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: November 24, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Heinrich Bathelt, Winfried Ehrl, Frank Wehowsky, Rolf Kleber, Werner Lotz, Wolfgang Glenz, Hubert Herdt, Lothar Jackel, Jan-Hilbert Mast, Karl Hintermeier, Manfred Muller