Patents by Inventor Franz Schade

Franz Schade 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).

  • Process for retanning mineral tanned leathers with aromatic sulphonic acids
    Patent number: 5352241
    Abstract: Process for retanning mineral-tanned leathers, characterised in that the retanning agents used are sulphonic acids and/or salts thereof of the general formula ##STR1## wherein R represents hydrogen, --CH.sub.3 or the radicals ##STR2## X represents hydrogen, an alkali metal ion, especially sodium, potassium or lithium ion, or an ammonium ion andn represents 1, 2, 3 or 4.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: October 4, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz Schade, Wilhelm Krummel, Bernhard Wehling, Henricus Slaats
  • Process for producing chrome leather
    Patent number: 5340365
    Abstract: In the production of chrome leather, a pretreatment of delimed and bated pelts with condensation products not having a tanning action leads to substrates which, without any problems, can be mechanically dewatered and shaved or split and shaved.The properties of the leathers produced therefrom by chrome tanning do not differ from those of leathers which have been conventionally chrome-tanned and shaved.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: August 23, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Wehling, Franz Schade, Joachim Kochta, Herbert Burkhardt, Peter Schindlmayr
  • Terpolymers of maleic acid anhydride, (meth)acrylic acid, and (meth)acrylonitrile
    Patent number: 4737549
    Abstract: Terpolymers of 30 to 75% by weight of maleic acid (anhydride), 5 to 60% by weight of (meth)acrylic acid and 5 to 40% by weight of (meth)acrylonitrile are suitable as retanning agents for mineral-tanned leather.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: April 12, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bruno Bomer, Franz Schade
  • Condensation products of terphenylsulphonic acids, naphthalenesulphonic acids, bis-(4-hydroxyphenyl) sulphone and formaldehyde
    Patent number: 4245996
    Abstract: Condensation products which are obtained by co-condensation, in an acid aqueous medium, of terphenylsulphonic acids, naphthalenesulphonic acid, bis-(4-hydroxyphenyl) sulphone and compounds which release formaldehyde are used as tanning agents for the production of leather and as re-tanning agents for re-tanning mineral-tanned leather.
    Type: Grant
    Filed: July 25, 1979
    Date of Patent: January 20, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz Schade, Reinhard Nebeling, Bruno Zinz