Patents by Inventor Walter Breitschaft

Walter Breitschaft 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 of paper
    Patent number: 5554261
    Abstract: A process for dyeing paper in connection with paper manufacture by adding water-soluble anionic dyes and cationic polymers which contain vinylamine units to the paper pulp as fixing agents and removing water from the paper pulp with the formation of dyed paper is described.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: September 10, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Claudia Nilz, Norbert Sendhoff, Walter Breitschaft, Manfred Zillig, Primoz Lorencak
  • Aqueous dye preparations containing coumarin dyes
    Patent number: 5531797
    Abstract: Aqueous dye preparations contain from 12 to 30% by weight, based on the weight of the preparation and calculated as free acid, of a dye of the formula ##STR1## where L.sup.1 and L.sup.2 are each C.sub.1 -C.sub.4 -alkyl and Cat.sup..sym. is an alkali metal ion or an unsubstituted or substituted ammonium ion, and are used for coloring paper stocks.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: July 2, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Rudolf Bermes, Walter Breitschaft
  • Doubled triphenylmethane dyes having bis acylpiperazine linkage
    Patent number: 5051504
    Abstract: Triphenylmethane dyes of the formula ##STR1## where each R.sup.1 is independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.6 -alkyl, or two R.sup.1 radicals together with the nitrogen atom joining them form a heterocyclic radical,R.sup.2 and R.sup.5 is independently of the others hydrogen or C.sub.1 -C.sub.4 -alkyl,R.sup.3 and R.sup.4 is independently of the others hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or halogen,An.sup..crclbar. is one equivalent of an anion, andn is 1 or 2,preparable from piperazine derivatives as intermediates, are useful for coloring paper.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: September 24, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Erwin Hahn, Walter Breitschaft, Udo Mayer, Gunter-Rudolf Schroeder
  • Electrostatic toner
    Patent number: 4912006
    Abstract: An electrostatic toner consists of a polymer a charge controlling component and an optional color-giving component, wherein the charge controlling agent component comprises one or more compounds of the formula `(I)`, ##STR1## ps where R.sup.1 is chlorine or methyl, R.sup.2 is C.sub.4 -C.sub.22 -alkyl, benzyl or 2-phenylethyl, A.THETA. is an anion, n is 0, 1 or 2, m is 1 or 2 and r is 1 or 2.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: March 27, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter Breitschaft, Erwin Czech, Udo Mayer, Guenther Seybold, Horst Bruder, Rainer Dyllick-Brenzinger
  • Novel heterocycle-containing trisazo dyes
    Patent number: 4784668
    Abstract: Compounds which, in the form of the free acid, are of the general formula I ##STR1## where D is phenyl which unsubstituted or substituted by fluorine, chlorine, bromine, nitro, cyano, C.sub.1 -C.sub.4 -alkylsulfonyl, C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.4 -alkoxy, carboxyl, C.sub.1 -C.sub.4 -alkoxycarbonyl or hydroxysulfonyl or by unsubstituted or substituted carbamyl or sulfamyl, andK is a radical of a heterocyclic coupling component, and the rings A and E may furthermore be substituted by methyl, methoxy, chlorine or hydroxysulfonyl.
    Type: Grant
    Filed: May 13, 1987
    Date of Patent: November 15, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter Breitschaft, Udo Mayer, Guenther Seybold