Patents by Inventor Norbert Munch

Norbert Munch 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).

  • Economy chrome tanning
    Patent number: 4978361
    Abstract: Process for economy chrome tanning, which comprises pretreating the pelt prior to tanning with 0.5 to 2% by weight, preferably 0.7 to 1,2% by weight, of an aldehyde- or keto-carboxylic acid, tanning in a conventional manner and then finish-tanning with 2 to 4.5% by weight of a mixture of a chromium(III) salt, an acid-binding agent and an aromatic di- or tricarboxylic acid or a salt thereof.
    Type: Grant
    Filed: April 25, 1989
    Date of Patent: December 18, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karlheinz Fuchs, Norbert Munch
  • Processing for rendering leather hydrophobic and oleophobic by impregnation with fluoro chemicals
    Patent number: 4971835
    Abstract: The leather is treated with a resin, quaternary ammonium compound, amine or polymer before the impregnation with the fluoro chemicals. With these auxiliaries, a uniform effectiveness of the fluoro chemicals which act on the surface is achieved, regardless of the procedure or the chemicals previously introduced into the leather. These auxiliaries can optionally also be applied to the leather together with the fluoro chemicals.
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: November 20, 1990
    Assignee: Hoecsht Aktiengesellschaft
    Inventors: Norbert Munch, Lothar Schlosser, Gustav Hudec
  • Process for short-term preservation of rawhides and skins
    Patent number: 4935031
    Abstract: The process for the short-term preservation of rawhides and skins with an alkali metal chlorite solution which additionally also contains a compound of the formula 1 ##STR1## in which R denotes hydrogen or C.sub.1 -C.sub.12 -alkyl, Me denotes hydrogen or an alkali metal atom and n denotes 1 or 2. Because of their hydrotropic action, the addition of these compounds improves uniform penetration of the preservation solution into the hide.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: June 19, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Norbert Munch, Karlheinz Fuchs
  • Methylolated and optionally etherified urethanes containing fluoroalkyl ligands
    Patent number: 4877540
    Abstract: Methylolated and optionally etherified urethanes containing fluoroalkyl ligans with formaldehyde, with or witout subsequent etherification, and are in the form of their solutions or aqueous dispersions suitable for the treatment of textiles and leather.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: October 31, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Fritz Engelhardt, Karl Hintermeier, Manfred Muller, Norbert Munch, Hans Wagener