Patents Assigned to Cassella
  • Hydrophilic swellable graft polymers from maleic anhydride-alkylene substrate
    Patent number: 4931497
    Abstract: The present invention relates to hydrophilic swellable graft polymers which consist, in random distribution, to the extent of 0.5 to 20% by weight of radicals of the general formula I ##STR1## 79 to 99% by weight of radicals containing an acid group, of the general formula II ##STR2## and 0.1 to 2% by weight of crosslinking structures originating from monomers with at least two olefinically unsaturated double bonds, wherein the radicals R.sup.1 to R.sup.4 and n have the meanings given in claim 1, these graft polymers being used as absorbants for water and aqueous solutions.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: June 5, 1990
    Assignee: Cassella Aktiengesellschaft
    Inventors: Friedrich Engelhardt, Ullrich Riegel
  • Liquid formulations of 1,2-benzisothiazolin-3-one, their preparation and their use
    Patent number: 4923887
    Abstract: Antimicrobially active liquid composition formulation which comprises 1,2-benzisothiazolin-3-one and at least one amine-oxyethylate of the formula ##STR1## wherein R is alkyl or alkenyl each having 2 to 22 carbon atoms and the sum of m and n is a number from 2 to 30 is used as an improved biocide to preserve and protect aqueous solutions from infestation with micro-organisms.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: May 8, 1990
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Hans-Walter Bucking, Karl-Heinz Wallhausser
  • Process for the preparation of new crystal modification of an azo dyestuff
    Patent number: 4921505
    Abstract: In the process for the preparation of the dyestuff of the formula I ##STR1## by diazotization and coupling, the aqueous suspension present when the coupling has ended is heated to temperatures of 50.degree. C. up to the boiling point of the aqueous phase in the presence of a dispersing agent.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: May 1, 1990
    Assignee: Cassella Aktiengesellschaft
    Inventors: Gunther Effenberger, Hubert Kruse
  • Process for preparing 2,5-dichlorophenylthioglycollic acid
    Patent number: 4918221
    Abstract: A valuable starting material for the manufacture of tetrachlorothioindigo pigments is 2,5-dichlorophenylthioglycollic acid which is prepared by:(a) diazotizing 2,5-dichloroaniline with aqueous alkali metal nitrite at acidic pH to produce 2,5-dichlorophenyl-diazonium salt,(b) reacting the 2,5-dichlorophenyl-diazonium salt from (a) with thiourea in an aqueous medium at acidic pH in the presence of a catalyst to produce 2,5-dichlorophenyl-isothiuronium salt of the formula ##STR1## wherein X.sup..crclbar. is an anion of a mineral acid, (c) hydroloyzing the 2,5-dichlorophenylisothiuronium salt from (b), without intermediate isolation, at alkaline pH to produce 2,5-dichlorothiophenol and(d) condensing the 2,5-dichlorothiophenol with monochloroacetic acid to produce 2,5-dichlorophenylthioglycollic acid.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: April 17, 1990
    Assignee: Cassella AG
    Inventors: Wolfgang Bauer, Willi Steckelberg
  • Use of 2-oxo-1-pyrrolidineacetamide for the determination of the glomerular filtration rate in humans
    Patent number: 4908202
    Abstract: The use of 2-oxo-1-pyrrolidineacetamide for the determination of the glomerular filtration rate in humans.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: March 13, 1990
    Assignee: Cassella Aktiengesellschaft
    Inventor: Hans-Ulrich Schulz
  • Thienylpiperazinones, their preparation and their use
    Patent number: 4898866
    Abstract: 3-(Thien-2-yl)-piperazin-2-ones, substituted in the 3-position, of the general formula ##STR1## wherein R dentoes, for example, phenyl or (C.sub.1 -C.sub.6)-alkyl and R.sup.1 denotes 2-thienyl and pharmacologically tolerable acid addition salts thereof, which possess valuable nootropic properties. The invention also includes methods for making such compounds, formulations containing such compounds and methods for treating a host in need thereof.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: February 6, 1990
    Assignee: Cassella Aktiengesellschaft
    Inventors: Karl Schonafinger, Rudi Beyerle, Ursula Schindler
  • Allymercaptoacetylsydnonimines, processes for their preparation, and their use
    Patent number: 4888333
    Abstract: Substituted allylmercaptoacetylsydnonimines of the general formula I ##STR1## and their pharmacologically acceptable acid addition salts, in which R.sub.1 represents a secondary amino group of the formula ##STR2## and X denotes ##STR3## R.sub.2 denotes one of the radicals R.sub.3 OOC--, R.sub.4 SO.sub.2 -- or alkyl having1-4 C atoms,n denotes one of the values 1, 1 or 2,and R.sub.3 denotes alkyl having 1-4 C atoms,and R.sub.4 represents R.sub.3 or (R.sub.3).sub.2 N--, have valuable pharmacological properties.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: December 19, 1989
    Assignee: Cassella Aktiengessellschaft
    Inventors: Helmut Bohn, Melitta Just, Rolf-Eberhard Nitz
  • Water-soluble yellow monoazo dyestuffs
    Patent number: 4881977
    Abstract: Water-soluble, yellow monoazo dyestuffs of the formula ##STR1## wherein R.sup.1 is a moiety of the formula ##STR2## R.sup.2 is methyl, ethyl, methoxy or ethoxy, R.sup.3 is methyl or ethyl, andn is a number from 0.3 to 1.7,are useful for the preparation of recording fluids.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: November 21, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Willi Steckelberg, Josef Ritter
  • 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
  • Aqueous formulation of 1,2-benzisothiazolin-3-one
    Patent number: 4871754
    Abstract: Aqueous solutions are protected from infestation by micro-organisms by use of a biocide which is an aqueous formulation of the lithium salt of 1,2-benzisothiazolin-3-one.
    Type: Grant
    Filed: December 18, 1986
    Date of Patent: October 3, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Willi Steckelberg
  • Mixtures of blue disperse monoazo dyestuffs
    Patent number: 4851012
    Abstract: A mixture of monoazo dyestuffs which contains one or more dyestuffs of the formula I ##STR1## and one or more dyestuffs of the formula II ##STR2## wherein R.sup.1 and R.sup.2 independently of one another each denote linear or branched alkyl with 1 to 6 carbon atoms, R denotes linear or branched alkyl with 1 to 5 carbon atoms and Hal denotes chloro or bromo, are outstandingly suitable for dyeing and printing hydrophobic materials.
    Type: Grant
    Filed: February 1, 1988
    Date of Patent: July 25, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Hubert Kruse, Reinhard Kuhn, Margareta Boos
  • Tetrahydroquinoline derivatives, their use and pharmaceutical formulations containing them
    Patent number: 4845099
    Abstract: Derivatives of tetrahydroquinoline of the formula I ##STR1## and acid addition salts thereof, wherein n denotes 2, 3, 4, 5 or 6, R.sup.1 denotes, for example, alkyl, phenyl or pyridyl, R.sup.2 denotes the radical ##STR2## R.sup.3 and R.sup.4 independently of one another denote, for example, hydrogen, alkyl or cycloalkyl and R.sup.5 denotes, for example, hydrogen, alkyl or phenyl, have useful pharmacological properties.
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: July 4, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Ruger, Gerd Driesen, Helmut Bohn, Piero Martorana
  • Substituted 3-amino-sydnonimines, their use and pharmaceutical products containing them
    Patent number: 4845091
    Abstract: Optically active substituted 3-aminosydnonimines of the general formula I ##STR1## and their pharmacologically acceptable acid addition salts, wherein R.sup.1 denotes, for example, the radical R.sup.3 (R.sup.4)N-,R.sup.2 denotes the radical 1-methoxyethyl (--CH(CH.sub.3)OCH.sub.3), acetoxy-phenyl-methyl (--CH(C.sub.6 H.sub.5)O--COCH.sub.3), 1-(ethoxycarbonyl)-ethoxy (--O--CH.sub.3)CO.sub.2 C.sub.2 H.sub.5),R.sup.3 denotes alkyl(C.sub.1 -C.sub.4) andR.sup.4 denotes for example alkyl(C.sub.1 -C.sub.4),possess valuable pharmaceutical properties.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: July 4, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Karl Schonafinger, Rudi Beyerle, Helmut Bohn, Melitta Just, Piero Martorana, Rolf-Eberhard Nitz
  • Tanning agent and a process for its preparation
    Patent number: 4828570
    Abstract: Hides, skins and pelts are tanned by use of a tanning agent which comprises the reaction product of acetaldehyde, formaldehyde and a formylamino compound.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: May 9, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Riegel, Fritz Engelhardt, Kuno Reh, Helmut Croon, Hermann Becker, Werner Lotz
  • Processing for tanning leather
    Patent number: 4822372
    Abstract: An improved process for tanning leather by treating animal skins with a water-soluble melamine-formaldehyde resin in the presence of an acid catalyst towards the end is improved by using a melamine-formaldehyde resin which is at least partially etherified with a glycol ether, alkyl glycol ether, or both.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: April 18, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Frank Forster, Karlfried Keller, Hermann Becker, Werner Lotz
  • 4,5-dihydro-3(2H)-pyridazinones and their pharmacological use
    Patent number: 4816454
    Abstract: Substituted 4,5-dihydro-3(2H)-pyridazinones of the formula I ##STR1## wherein R, for example, denotes a radical of the formula ##STR2## R.sup.1 and R.sup.2, for example, denote hydrogen or methyl, R.sup.3, for example, denotes 2-methoxy-ethoxy, 3-pyridyl-methoxy, amino-carbonyl-methoxy, hydroxy-carbonyl-methoxy, methyl-thio, (2-methoxy-ethyl)-amino-carbonyl-methoxy, 3-pyridyl-methyl or 5-methyl-1,3,4-oxadiazol-2-yl and R.sup.4, for example, denotes hydrogen, have useful pharmacological properties and can therefore be used for the preparation of pharmacological products.
    Type: Grant
    Filed: September 12, 1985
    Date of Patent: March 28, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Gerhard Zoller, Rudi Beyerle, Melitta Just, Helmut Bohn, Piero Martorana, Rolf-Eberhard Nitz
  • Liquid formulations of disperse dyestuffs containing inorganic oxides or silicates for dyeing textile materials
    Patent number: 4812143
    Abstract: Liquid formulations of disperse dyestuffs for dyeing hydrophobic synthetic fiber materials or mixtures of synthetic fiber materials with cellulose fiber material or wool contain from 0.1 to 10% by weight of pulverulent highly disperse inorganic oxides or silicates or mixtures of both said oxides and silicates having a specific surface area (BET) of 20 to 800 m.sup.2 /g.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: March 14, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Klaus Hofmann, Ulrich Buhler, Erwin Dietz
  • Wet-fastness properties of sulphur dyestuffs dyeings on cellulose treated with poly-di-allyl-ammonium salt
    Patent number: 4810254
    Abstract: The wet-fastness properties of cellulose materials dyed with sulfur dyestuffs is improved by treating the cellulose materials, before, during or after dyeing, with a polymer which is a copolymer or homopolymer of a monomer of the formula ##STR1## wherein R.sup.1 and R.sup.2 denote, for example, hydrogen or (C.sub.1 -C.sub.22)-alkyl; R.sup.3 and R.sup.4 denote hydrogen or methyl; and Y.sup..crclbar. denotes, for example, a monovalent anion.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: March 7, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Karl-Heinz Keil, Gert Nagl, Manfred Kaiser, Joachim Steinbach, Klaus Sternberger
  • 2-cyano-4,6-dinitrophenyl mono-azo dyes for polyester and cellulose acetate
    Patent number: 4802889
    Abstract: Monoazo dyestuff of the formula ##STR1## wherein R.sup.1 is 4 alkyl having 1 to 3 carbon atoms, andR.sup.2 is methyl, ethyl or alkoxy having 1 to 4 carbon atoms hich is unsubstituted or substituted by methoxy or ethoxy is useful for dyeing and printing hydrophobic fibers a blue color.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: February 7, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Bte,uml/u/ hler, Horst Tappe, Reinhard Kuhn, Albert Bode, Margareta Boss
  • Preparation of azo dyestuffs by diazotization and coupling in the presence of an ester
    Patent number: 4795807
    Abstract: Azo disperse dyestuffs are prepared by diazotization and coupling in an aqueous phase, the coupling being carried out in the presence of an ester of a lower aliphatic carboxylic acid.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: January 3, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Friedrich Schophoff, Wolf Weidemuller