Patents by Inventor Christa Fest

Christa Fest 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).

  • Patent number: 5328896
    Abstract: A herbicidal sulphonylurea salt of the formula ##STR1## in which M.sup..sym. represents an alkali metal ion or the counterion, formed by protonation, of a basic organic nitrogen compound,R represents halogenoalkyl,R.sup.1 represents optionally substituted radicals from the series comprising alkyl, alkenyl, alkinyl or aralkyl,R.sup.2 represents hydrogen, halogen, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X represents nitrogen or a --CH group,Y represents nitrogen or a --CR.sup.3 group where R.sup.3 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ represents nitrogen or a --CR.sup.4 group where R.sup.4 represents hydrogen, halogen, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, alkylamino or dialkylamino.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: July 12, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jochem Riebel, Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Dieter Feucht, Klaus Lurssen, Hans-Joachim Santel, Robert R. Schmidt
  • Patent number: 5221317
    Abstract: Herbicidally active sulphonylamino guanidinoazines of the formula ##STR1## in which R.sup.1 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl and hetaryl,R.sup.2 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl, hetaryl and dialkylamino,R.sup.3 stands for hydrogen, halogen, hydroxyl, alkyl, halogenaoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,R.sup.5 stands for hydrogen, halogen, hydroxyl, alkyl, alkoxy, halogenoalkoxy, alkylthio, alkylamino or dialkylamino, andM stands for hydrogen, a metal equivalent, an ammonium equivalent, an alkylammonium equivalent, a dialkylammonium equivalent, or a trialkylammonium equivalent.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: June 22, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus-Helmut Muller, Christa Fest, Rolf Kirsten, Theodor Pfister, Hans-Jochem Riebel, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang, Joachim Kluth, Klaus Lurssen, Ernst R. Gesing
  • Patent number: 5217522
    Abstract: Herbicidal sulphonylguanidinoazines of the formula ##STR1## in which n represents the numbers 1 or 2,A represents nitrogen or a C-X group, where X represents hydrogen or halogen.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: June 8, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jochem Riebel, Christa Fest, Ernst R. F. Gesing, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Klaus Lurssen, Hans-Joachim Santel, Robert E. Schmidt
  • Patent number: 5213608
    Abstract: Herbicidal substituted sulphonylamidinohydrazones of the formula ##STR1## in which R.sup.1 represents in each case optionally substituted aryl, aralkyl or heteroaryl,R.sup.2 represents hydrogen, or represents in each case optionally substituted alkyl, aryl or aralkyl,R.sup.3 represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkadienyl, alkinyl, (hetero)aryl, aralkyl, aralkenyl, alkoxy, alkoxycarbonyl or dialkylamino, or together with R.sup.2 represents optionally substituted alkanediyl,R.sup.4 represents hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X represents nitrogen or a --CH group,Y represents nitrogen or a --CR.sup.5 group whereR.sup.5 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ represents nitrogen or a --CR.sup.6 group whereR.sup.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: May 25, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Ernst R. F. Gesing, Rolf Kirsten, Joachim Kluth, Reinhard Lantzsch, Klaus-Helmut Muller, Theodor Pfister, Hans-Jochem Riebel, Frank Rosenfeldt, Hans-Joachim Santel, Klaus Lurssen, Robert R. Schmidt
  • Patent number: 5211740
    Abstract: Herbicidal aminoguanidinoazines of the formula ##STR1## in which R.sup.1 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl and hetaryl,R.sup.2 stands for hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X stands for nitrogen or a --CH group,Y stands for nitrogen or a --CR.sup.3 group whereR.sup.3 stands for hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ stands for nitrogen or a --CR.sup.4 group whereR.sup.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: May 18, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Hans-Jochem Riebel, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 5167692
    Abstract: Herbicidal substituted sulphonylamidinohydrazones of the formula ##STR1## in which R.sup.1 represents in each case optionally substituted aryl, aralkyl or heteroaryl,R.sup.2 represents hydrogen, or represents in each case optionally substituted alkyl, aryl or aralkyl,R.sup.3 represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkadienyl, alkinyl, (hetero)aryl, aralkyl, aralkenyl, alkoxy, alkoxycarbonyl or dialkylamino, or together with R.sup.2 represents optionally substituted alkanediyl,R.sup.4 represents hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X represents nitrogen or a --CH group, Y represents nitrogen or a --CR.sup.5 group whereR.sup.5 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ represents nitrogen or a --CR.sup.6 group whereR.sup.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: December 1, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Ernst R. F. Gesing, Rolf Kirsten, Joachim Kluth, Reinhard Lantzsch, Klaus-Helmut Muller, Theodor Pfister, Hans-Jochem Riebel, Frank Rosenfeldt, Hans-Joachim Santel, Klaus Lurssen, Robert R. Schmidt
  • Patent number: 5125960
    Abstract: Herbicidal substituted arylsulphonylaminoguanidinoazines of the formula ##STR1## in which R.sup.1 represents in each case optionally substituted aryl, aralkyl or heteroaryl,R.sup.2 represents hydroxyl or amino, or represents in each case optionally substituted alkoxy or alkylamino,R.sup.3 represents hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X represents nitrogen or a --CH group,Y represents nitrogen or a --CR.sup.4 group, where R.sup.4 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ represents nitrogen or a --CR.sup.5 group, where R.sup.5 represents hydrogen, halogen, hydroxyl, alkyl, alkoxy, alkylthio, alkylamino or dialkylamino,with the exception of the compound N'-(4,6-dimethylpyrimidin-2-yl)-N"-(2-methoxycarbonyl-phenylsulphonylamino )-N"'-(2-methoxycarbonyl-phenylsulphonyl)guanidine.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: June 30, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Hans-Jochem Riebel, Klaus Lurssen, Hans-Joachim Santel, Robert R. Schmidt
  • Patent number: 5092917
    Abstract: Herbicidal aminoguanidinoazines of the formula ##STR1## in which R.sup.1 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl and hetaryl,R.sup.2 stands for hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X stands for nitrogen or a --CH group,Y stands for nitrogen or a --CR.sup.3 group whereR.sup.3 stands for hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl, andZ stands for nitrogen or a --CR.sup.4 group whereR.sup.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: March 3, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Hans-Jochem Riebel, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 5091529
    Abstract: Herbicidal substituted sulphonylaminoazoles of the formula ##STR1## in which R.sup.1 is optionally substituted alkyl, aralkyl, aryl or heteroaryl,R.sup.2 is hydrogen or --SO.sub.2 --R.sup.1,R.sup.3 is hydrogen, halogen, hydroxyl, mercapto, amino, or an optionally substituted alkyl, alkoxy, alkylthio, alkylamino or dialkylamino radical,A is CH, nitrogen or,at least one of A, D and E is ##STR2## and the others may be that or CH or nitrogen, and X, Y and Z each is nitrogen or optionally substituted C, and salts thereof.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: February 25, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Kirsten, Joachim Kluth, Christa Fest, Ernst Gesing, Klaus-Helmut Muller, Hans-Jochem Riebel, Peter Babczinski, Otto Schallner, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 5021082
    Abstract: Herbicidal substituted sulphonylaminoazoles of the formula ##STR1## in which R.sup.1 is optionally substituted alkyl, aralkyl, aryl or heteroaryl,R.sup.2 is hydrogen or --SO.sub.2 --R.sup.1,R.sup.3 is hydrogen, halogen, hydroxyl, mercapto, amino, or an optionally substituted alkyl, alkoxy, alkylthio, alkylamino or dialkylamino radical,A is CH, nitrogen or,at least one of A, D and E is ##STR2## and the others may be that or CH or nitrogen, and X, Y and Z each is nitrogen or optionally substituted C, and salts thereof.
    Type: Grant
    Filed: April 3, 1990
    Date of Patent: June 4, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Kirsten, Joachim Kluth, Christa Fest, Ernst Gesing, Klaus-Helmut Muller, Hans-Jochem Riebel, Peter Babczinski, Otto Schallner, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 4990637
    Abstract: Herbicidally active novel substituted 1-benzylsulphonyl-3-heteroaryl(thio)-ureas of the formula ##STR1## in whichQ.sub.1 represents oxygen or sulphur,R.sup.1 represents hydrogen, or represents optionally substituted radicals from the series comprising alkyl, alkenyl, alkynyl and aralkyl,R.sup.2 represents hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,R.sup.3 represents hydrogen or alkyl,R.sup.4 represents halogenoalkyl,X represents nitrogen or a --CH grouping,Y represents nitrogen or a --CR.sup.5 grouping,R.sup.5 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl,Z represents nitrogen or a --CR.sup.6 grouping, andR.sup.6 represents hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, alkylamino or dialkylamino,and salts thereof with metals and basic organic nitrogen compounds. The benzylsulphonyl moieties are also new.
    Type: Grant
    Filed: January 30, 1990
    Date of Patent: February 5, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Klaus-Helmut Muller, Theodor Pfister, Hans-Jochem Riebel, Ernst Kysela, Hans-Joachim Santel, Robert R. Schmidt, Robert H. Strang
  • Patent number: 4988379
    Abstract: The invention relates to new sulphonyliso(thio)-urea derivatives of the general formula (I) ##STR1## in which R.sup.1 represents an optionally substituted radical from the series comprising alkyl, aralkyl, aryl and heteroaryl,R.sup.2 represents an optionally substituted and/or optionally fused 6-membered aromatic heterocyclic radical containing at least one nitrogen atom,R.sup.3 represents an optically substituted aromatic or heteroaromatic radical,X represents oxygen or sulphur andM represents hydrogen or an equivalent of a metal,and adducts of compounds of the formula (I) with strong acids, processes for their preparation, and their use as herbicides.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: January 29, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Joachim Diehr, Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Theodor Pfister, Uwe Priesnitz, Hans-Jochem Riebel, Wolfgang Roy, Hans-Joachim Santel, Robert R. Schmidt, Ludwig Eue
  • Patent number: 4952233
    Abstract: Herbicidally active sulphonylamino guanidinoazines of the formula ##STR1## in which R.sup.1 stands for a optionally substituted radical from the series comprising alkyl, aralkyl, aryl and hetaryl, R.sup.2 stands for an optionally substituted radical from the series comprising alkyl, aralkyl, aryl, hetaryl and dialkylamino, R.sup.3 stands for hydrogen, halogen, hydroxyl, alkyl, halogenoalkyl, alkoxyalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,X stands for nitrogen or a --CH-- grouping,Y stands for nitrogen or a --CR.sup.4 -- grouping,whereinR.sup.4 stands for hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl,Z stands for mitrogen or a --CR.sup.5 -- grouping,whereinR.sup.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: August 28, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus-Helmut Muller, Christa Fest, Rolf Kirsten, Theodor Pfister, Hans-Jochem Riebel, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 4941912
    Abstract: Herbicidal substituted sulphonylaminoazoles of the formula ##STR1## in which R.sup.1 is optionally substituted alkyl, aralkyl, aryl or heteroaryl,R.sup.2 is hydrogen or --SO.sub.2 --R.sup.1,R.sup.3 is hydrogen, halogen, hydroxyl, mercapto, amino, or an optionally substituted alkyl, alkoxy, alkylthio, alkylamino or dialkylamino radical,A is CH, nitrogen or,at least one of A, D and E is ##STR2## and the others may be that or CH or nitrogen, and X, Y and Z each is nitrogen or optionally substituted C, and salts thereof.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: July 17, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Kirsten, Joachim Kluth, Christa Fest, Ernst Gesing, Klaus-Helmut Muller, Hans-Jochem Riebel, Peter Babczinski, Otto Schallner, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 4931465
    Abstract: Fungicidally active novel benzaldoxime carbamate derivatives of the formula ##STR1## in which X represents hydrogen or halogen,Y represents halogen or alkyl,Z represents hydrogen, halogen, alkyl, alkoxy or halogenoalkyl, andR represents alkyl, halogenoalkyl, cyanoalkyl, and also phenyl or phenylalkyl, both of which are optionally monosubstituted to polysubstituted by identical or different substituents, or represents tosyl, or cycloalkyl which is optionally monosubstituted to polysubstituted by identical or different substituents,with the exception of those compounds in which X represents 2-chloro, Y represents 6-chloro and Z represents 4-methyl. Many of the benzaldoxime intermediates therefor are also new.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: June 5, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Wilhelm Brandes, Stefan Dutzmann, Gerd Hanssler, Karl-Heinz Kuck
  • Patent number: 4927454
    Abstract: Herbicidally active novel substituted 1-benzylsulphonyl-3-heteroaryl(thio)-ureas of the formula ##STR1## in which Q represents oxygen or sulphur,R.sup.1 represents hydrogen, or represents optionally substituted radicals from the series comprising alkyl, alkenyl, alkynyl and aralkyl,R.sup.2 represents hydrogen, halogen, hydroxy, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, halogenoalkylthio, amino, alkylamino or dialkylamino,R.sup.3 represents hydrogen or alkyl,R.sup.4 represents halogenoalkyl,X represents nitrogen or a --CH grouping,Y represents nitrogen or a --CR.sup.5 grouping,R.sup.5 represents hydrogen, halogen, cyano, alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl,Z represents nitrogen or a --CR.sup.6 grouping, andR.sup.6 represents hydrogen, halogen, hydroxy, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio, alkylamino or dialkylamino,and salts thereof with metals and basic organic nitrogen compounds. The benzylsulphonyl moieties are also new.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: May 22, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Klaus-Helmut Muller, Theodor Pfister, Hans-Jochem Riebel, Ernst Kysela, Hans-Joachim Santel, Robert R. Schmidt, Robert H. Strang
  • Patent number: 4923505
    Abstract: Herbicidal sulphonyliso(thio)ureas of the formula ##STR1## in which M stands for hydrogen or an alkali metal equivalent or an alkaline earth metal equivalent,n stands for the numbers zero or 1,Q stands for oxygen or sulphur,R.sup.1 stands for C.sub.1 -C.sub.6 -alkyl which is optionally substituted by substituents from the series comprising halogen or C.sub.1 -C.sub.4 -alkoxy,R.sup.2 stands for an optionally substituted phenyl radical,R.sup.3 stands for C.sub.1 -C.sub.2 -alkyl or C.sub.1 -C.sub.2 -alkoxy which are optionally substituted by halogen,R.sup.4 stands for C.sub.1 -C.sub.2 -alkyl or C.sub.1 -C.sub.2 -alkoxy which are optionally substituted by halogen, and Z stands for N or CH, with the proviso that Z stands for N when n stands for zero.Intermediates of the formula ##STR2## and ##STR3## are also new.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: May 8, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jochem Riebel, Christa Fest, Klaus-Helmut Muller, Hans-Joachim Santel, Robert R. Schmidt, Harry Strang
  • Patent number: 4911752
    Abstract: A method of combating unwanted vegetation which comprises applying to such vegetation or to a locus from which it is desired to exclude such vegetation a herbicidally effective amount of a halogenoalkoxyphenylsulphonylisothioureidoazine of the formula ##STR1## in which R.sup.1 represents halogeno-C.sub.1 -C.sub.4 -alkoxy,R.sup.2 represents hydrogen, halogen, hydroxyl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -halogenoalkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -halogenoalkoxy, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.4 -halogenoalkylthio, amino, C.sub.1 -C.sub.4 -alkylamino or di-(C.sub.1 -C.sub.4 -alkyl)amino,X represents nitrogen or a --CH-- grouping,Y represents nitrogen or a --CR.sup.4 -- grouping,whereinR.sup.4 represents hydrogen, halogen, cyano, C.sub.1 -C.sub.4 -alkyl, formyl, C.sub.1 -C.sub.4 -alkyl-carbonyl or C.sub.1 -C.sub.4 -alkoxy-carbonyl, andZ represents nitrogen or a --CR.sup.5 -- grouping,whereinR.sup.5 represents hydrogen, halogen, hydroxyl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: March 27, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Klaus-Helmut Muller, Theodor Pfister, Hans-Jochem Riebel, Hans-Joachim Santel, Robert R. Schmidt
  • Patent number: 4910221
    Abstract: Pesticidal novel .alpha.-methylsulphonyl-benzaldoxime derivatives of the formula ##STR1## in which R represents alkyl, alkoxy, halogenoalkyl, halogenoalkoxy or alkenyloxy, aryl or aryloxy which is in each case optionally monosubstituted to polysubstituted by identical or different substituents, aralkyloxy which is optionally monosubstituted to polysubstituted in the aryl radical by identical or different substituents, cycloalkyloxy which is optionally monosubstituted to polysubstituted by identical or different substituents, or a heterocyclic ring which is optionally monosubstituted to polysubstituted by identical or different substituents,X represents hydrogen or halogen, andHal represents halogen.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: March 20, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christa Fest, Gerd Hanssler, Wilhelm Brandes
  • Patent number: RE33298
    Abstract: The invention relates to new 1-(2-oxyaminosulphonylphenylsulphonyl)-3-heteroaryl-ureas of the general formula (I) ##STR1## in which R.sup.1 represents an optionally substituted radical from the series comprising alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aralkyl and aryl,R.sup.2 represents hydrogen or an optionally substituted radical from the series comprising alkyl, alkenyl, alkinyl and aralkyl andR.sup.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: August 14, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Joachim Diehr, Christa Fest, Rolf Kirsten, Joachim Kluth, Klaus-Helmut Muller, Theodor Pfister, Uwe Priesnitz, Hans-Jochem Riebel, Wolfgang Roy, Hans-Joachim Santel, Robert R. Schmidt