Patents by Inventor Rolf Schurter
Rolf Schurter 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).
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Patent number: 4707177Abstract: N-(2-Heterocyclylphenylsulfonyl)-N'-pyrimidinylureas and N-(2-heterocyclylphenylsulfonyl)-N'-triazinylureas of the general formula I ##STR1## and the salts thereof with amines, alkali metal bases or alkaline earth metal bases or with quaternary ammonium bases have good pre- and postemergence selective herbicidal and growth regulating properties.In this formulaA is a substituted furyl, thienyl or pyrrole radical,E is nitrogen or the methine group -CH.dbd.,Z is oxygen or sulfur,R.sup.1 is customary phenyl substitutent,R.sup.2 is hydrogen, lower alkyl or lower alkoxy,R.sup.3 and R.sup.4 are each independently hydrogen, lower alkyl, lower alkoxy, lower alkylthio, cycloalkyl, halogen, haloalkyl, haloalkoxy, haloalkylthio, alkoxyalkyl, dialkoxyalkyl, amino, diethylamino.Type: GrantFiled: October 16, 1986Date of Patent: November 17, 1987Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Georg Pissiotas
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Patent number: 4684730Abstract: The claimed invention is a pyrazine of the formula: ##STR1## where Z is oxygen or sulfur and R is C.sub.1 -C.sub.4 alkyl, phenyl or benzyl. The pyrazine ring may be variously further substituted. The above noted pyrazines are useful as intermediates in the production of herbicides.Type: GrantFiled: March 21, 1986Date of Patent: August 4, 1987Assignee: Ciba-Geigy CorporationInventors: Beat Bohner, Werner Fory, Rolf Schurter, Georg Pissiotas
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Patent number: 4681620Abstract: The invention relates to novel sulfonylureas of the formula I ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.5 alkyl,R.sub.2 and R.sub.3, each independently of the other, are hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, C.sub.1 -C.sub.5 alkylthio, C.sub.1 -C.sub.5 haloalkyl, halogen, C.sub.1 -C.sub.5 haloalkylthio, C.sub.1 -C.sub.4 alkylamino, C.sub.1 -C.sub.4 dialkylamino, an alkoxyalkyl group or alkoxyalkoxy group, each containing not more than 6 carbon atoms,Z is oxygen or sulfur,E is --CH.dbd. or --N.dbd., andQ is an unsubstituted or substituted 6-membered heterocyclic radical containing 2 to 3 nitrogen atoms and bound through a carbon atom,and the salts thereof.A process for the preparation of the novel compounds and the use thereof are also described. The compounds of formula I can be used in the form of agriculturally useful compositions for controlling weeds and/or for selectively influencing plant growth.Type: GrantFiled: March 21, 1986Date of Patent: July 21, 1987Assignee: Ciba-Geigy CorporationInventors: Beat Bohner, Werner Fory, Rolf Schurter, Georg Pissiotas
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Patent number: 4664695Abstract: N-Phenylsulfonyl-N'-pyrimidinylureas of the general formula I ##STR1## and the salts of these compounds with amines, alkali metal bases or alkaline earth metal bases or with quaternary ammonium bases, have good selective herbicidal and growth regulating properties when applied pre- and postemergence.The symbols in formula I have the following meanings:R.sub.1 is hydrogen, halogen, nitro, cyano, or an alkyl, alkoxy, alkylthio, alkylsulfonyl, alkylcarbonyl, alkylcarbamoyl or alkoxycarbonyl group, each unsubstituted or substituted by halogen or alkoxy,R.sub.2 is hydrogen, halogen, alkyl, or an alkyl, alkoxy or alkylthio group, each unsubstituted or substituted by halogen or alkoxy,R.sub.3 is alkyl, haloalkyl, alkoxy or haloalkoxy,R.sub.4 is hydrogen, halogen, R.sub.3, alkylamino or dialkylamino,R.sub.Type: GrantFiled: March 29, 1985Date of Patent: May 12, 1987Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Rudolph C. Thummel, Werner Topfl, Willy Meyer, Dieter Durr
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Patent number: 4640703Abstract: 2-Phenoxypropionic acid cyanamides of the formula ##STR1## have a useful selective herbicidal activity against weeds, preferably grass weeds, in crops of useful plants.In this formulaR is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.4 alkenyl, C.sub.3 -C.sub.4 alkynyl or C.sub.2 -C.sub.4 alkoxyalkyl, andT is a radical ##STR2## wherein A is oxygen or sulfur,X is fluorine, chlorine, bromine, iodine or trifluoromethyl,Y is hydrogen, fluorine, chlorine, bromine or trifluormethyl, andZ is nitrogen or the methine bridge.Type: GrantFiled: November 30, 1984Date of Patent: February 3, 1987Assignee: Ciba-Geigy CorporationInventors: Beat Bohner, Hermann Rempfler, Rolf Schurter
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Patent number: 4637829Abstract: N-(2-Heterocyclylphenylsulfonyl)-N'-pyrimidinylureas and N-(2-heterocyclylphenylsulfonyl)-N'-triazinylureas of the general formula I ##STR1## and the salts thereof with amines, alkali metal bases or alkaline earth metal bases or with quaternary ammonium bases have good pre-and postemergence selective herbicidal and growth regulating properties.In this formulaA is a substituted furyl, thienyl or pyrrole radical,E is nitrogen or the methine group --CH.dbd.,Z is oxygen or sulfur,R.sup.1 is customary phenyl substituent,R.sup.2 is hydrogen, lower alkyl or lower alkoxy,R.sup.3 and R.sup.4 are each independently hydrogen, lower alkyl, lower alkoxy, lower alkylthio, cycloalkyl, halogen, haloalkyl, haloalkoxy, haloalkylthio, alkoxyalkyl, dialkoxyalkyl, amino, diethylamino.Type: GrantFiled: April 15, 1985Date of Patent: January 20, 1987Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Georg Pissiotas
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Patent number: 4632695Abstract: N-Phenylsulfonyl-N'-triazinylureas of the general formula I ##STR1## and the salts of these compounds with amines, alkali metal bases or alkaline earth metal bases or with quaternary ammonium bases, have good selective herbicidal and growth regulating properties when applied pre- and postemergence. The symbols in formula I have the following meanings:R.sub.1 is hydrogen, halogen, nitro, cyano, or an alkyl, alkoxy, alkylthio, alkylsulfonyl, alkylcarbonyl, alkylcarbamoyl or alkoxycarbonyl group, each unsubstituted or substituted by halogen or alkoxy,R.sub.2 is hydrogen, halogen, alkyl, or an alkyl, alkoxy or alkylthio group, each unsubstituted or substituted by halogen or alkoxy,R.sub.3 is alkyl, haloalkyl, alkoxy or haloalkoxy,R.sub.4 is hydrogen, halogen, R.sub.3, alkylamino or dialkylamino,R.sub.Type: GrantFiled: December 6, 1985Date of Patent: December 30, 1986Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Rudolph C. Thummel, Werner Topfl, Willy Meyer, Dieter Durr
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Patent number: 4626272Abstract: Compounds of the formula ##STR1## wherein Z is phenyl optionally mono- or di-substituted by halogen, nitro, cyano, trifluoromethyl, C.sub.1 -C.sub.4 alkoxy or C.sub.1 -C.sub.4 alkyl; naphthyl; or furyl;R is cyano, C.sub.1 -C.sub.4 alkoxy, di(C.sub.1 -C.sub.6 -alkyl)-amino, halogen or C.sub.1 -C.sub.4 alkyl;n is 0, 1 or 2;Y is oxygen or sulfur;Q is straight-chain or branched-chain C.sub.2 -C.sub.6 -alkylene;each of R.sub.1 and R.sub.2 is C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 -alkenyl, C.sub.3 -C.sub.6 -alkynyl or C.sub.3 -C.sub.8 -cycloalkyl; orR.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form a C.sub.5 or C.sub.6 heterocyclic group with a maximum of two hetero atoms, which group is optionally substituted by C.sub.1 -C.sub.3 alkyl are useful selective herbicides for post-emergence application in crops of cereals, rice and maize.Type: GrantFiled: December 14, 1984Date of Patent: December 2, 1986Assignee: Ciba-Geigy CorporationInventors: Hans-Georg Brunner, Rolf Schurter, Henry Szczepanski
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Patent number: 4612037Abstract: The invention relates to novel sulfonylureas of the formula I ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.5 alkyl,R.sub.2 and R.sub.3, each independently of the other, are hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, C.sub.1 -C.sub.5 alkylthio, C.sub.1 -C.sub.5 haloalkyl, halogen, C.sub.1 -C.sub.5 haloalkylthio, C.sub.1 -C.sub.4 alkylamino, C.sub.1 -C.sub.4 dialkylamino, an alkoxyalkyl group or alkoxyalkoxy group, each containing not more than 6 carbon atoms,Z is oxygen or sulfur,E is --CH.dbd. or --N.dbd., andQ is an unsubstituted or substituted 6-membered heterocyclic radical containing 2 to 3 nitrogen atoms and bound through a carbon atom,and the salts thereof.A process for the preparation of the novel compounds and the use thereof are also described. The compounds of formula I can be used in the form of agriculturally useful compositions for controlling weeds and/or for selectively influencing plant growth.Type: GrantFiled: May 19, 1983Date of Patent: September 16, 1986Assignee: Ciba-Geigy CorporationInventors: Beat Bohner, Werner Fory, Rolf Schurter, Georg Pissiotas
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Patent number: 4594097Abstract: N-Phenylsulfonyl-N'-pyrimidinylureas and N-phenylsulfonyl-N'-triazinylureas of the general formula I ##STR1## wherein A is a radical of the formula --C.tbd.C--R,m is 1 or 2,Z is oxygen or sulfur,R is hydrogen; unsubstituted or substituted, branched or unbranched C.sub.1 -C.sub.9 alkyl; unsubstituted or substituted C.sub.3 -C.sub.9 cycloalkyl; unsubstituted or substituted phenyl; or an unsubstituted or substituted 5- or 6-membered aromatic heterocyclic ring,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 alkyl, C.sub.2 -C.sub.5 alkenyl or a radical --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 alkyl, C.sub.2 -C.sub.5 alkenyl, C.sub.1 -C.sub.4 haloalkyl, or a radical --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4, each independently of the other, are hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 haloalkoxy, C.sub.1 -C.sub.4 haloalkylthio, halogen, C.sub.2 -C.sub.Type: GrantFiled: June 17, 1985Date of Patent: June 10, 1986Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Werner Fory, Willy Meyer
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Patent number: 4565887Abstract: N-Phenylsulfonyl-N'-pyrimidinyl- and -triazinylureas of the general formula ##STR1## and the salts of these compounds with amines, with alkali or alkaline-earth metal bases or with quaternary ammonium bases, have good pre- and post-emergence selective, herbicidal and growth-regulating properties.The symbols in this formula are as follows:A is a C.sub.3 -C.sub.6 -alkynyl group,E is the methine group or nitrogen,X is oxygen, sulfur or a sulfinyl or sulfonyl bridge,Z is oxygen or sulfur,m is the number one or two,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl or C.sub.2 -C.sub.5 -alkenyl or a group --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or C.sub.1 -C.sub.4 -haloalkyl, or a group --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4 independently of one another are each hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.Type: GrantFiled: January 19, 1984Date of Patent: January 21, 1986Assignee: Ciba-Geigy Corp.Inventors: Werner Fory, Karl Gass, Willy Meyer, Rolf Schurter
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Patent number: 4551531Abstract: The invention relates to N-arylsulfonyl-N'-pyrimidinyl ureas of the general formula ##STR1## and to the salts thereof with amines, alkali metal hydroxides or alkaline earth metal hydroxides or with quaternary ammonium bases. These compounds have good pre- and postemergence selective herbicidal and growth regulating properties.In the formula, R.sub.18 is hydrogen, alkyl or alkoxy, X is an unsubstituted or substituted phenyl radical or an unsubstituted or substituted naphthyl radical, Y is C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 haloalkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 haloalkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.2 -C.sub.3 alkoxyalkyl, halogen or an unsubstituted amino group and Z is oxygen or sulfur.Type: GrantFiled: July 26, 1984Date of Patent: November 5, 1985Assignee: Ciba Geigy CorporationInventors: Willy Meyer, Karl Gass, Werner Topfl, Rolf Schurter, Georg Pissiotas
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Patent number: 4537618Abstract: N-Phenylsulfonyl-N'-pyrimidinylureas and N-phenylsulfonyl-N'-triazinylureas of the general formula I ##STR1## wherein A is a radical of the formula --C.tbd.C--R,m is 1 or 2,E is the methine group or nitrogen,Z is oxygen or sulfur,R is hydrogen; unsubstituted or substituted, branched or unbranched C.sub.1 -C.sub.9 alkyl; unsubstituted or substituted C.sub.3 -C.sub.9 cycloalkyl; unsubstituted or substituted phenyl; or an unsubstituted or substituted 5- or 6-membered aromatic heterocyclic ring,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 alkyl, C.sub.2 -C.sub.5 alkenyl or a radical --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 alkyl, C.sub.2 -C.sub.5 alkenyl, C.sub.1 -C.sub.4 haloalkyl, or a radical --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4, each independently of the other, are hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 haloalkoxy, C.sub.1 -C.sub.Type: GrantFiled: May 19, 1983Date of Patent: August 27, 1985Assignee: Ciba Geigy CorporationInventors: Rolf Schurter, Werner Fory, Willy Meyer
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Patent number: 4523944Abstract: N-Phenylsulfonyl-N'-pyrimidinyl- and -triazinylureas of the general formula ##STR1## and the salts of these compounds with amines, with alkali or alkaline-earth metal bases or with quaternary ammonium bases, have good pre- and post-emergence selective, herbicidal and growth-regulating properties.The symbols in this formula are as follows:A is a C.sub.3 -C.sub.6 -alkynyl group,E is the methine group or nitrogen,X is oxygen, sulfur or a sulfinyl or sulfonyl bridge,Z is oxygen or sulfur,m is the number one or two,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl or C.sub.2 -C.sub.5 -alkenyl or a group --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or C.sub.1 -C.sub.4 -haloalkyl, or a group --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4 independently of one another are each hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.Type: GrantFiled: January 19, 1984Date of Patent: June 18, 1985Assignee: Ciba-Geigy CorporationInventors: Werner Fory, Karl Gass, Willy Meyer, Rolf Schurter
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Patent number: 4508560Abstract: The novel componds of the formula IZ--C.tbd.C--Het--Y--Q--A (I)are useful selective herbicides for post-emergence application in crops of cereals, rice and maize.The symbols in the formula I have the following meanings:Het is a pyridyl radical which is unsubstituted or substituted by one to three radicals R,A is a group --NR.sub.1 R.sub.2R.sub.1 and R.sub.2 independently of one another are each hydrogen, C.sub.3 -C.sub.6 -alkenyl, C.sub.3 -C.sub.6 -alkynyl, C.sub.3 -C.sub.8 -cycloalkyl orY is oxygen or sulfur,Q is a straight-chain or branched-chain C.sub.2 -C.sub.6 -alkylene bridge,R is cyano, C.sub.1 -C.sub.4 -alkoxy, di-(C.sub.1 -C.sub.6 -alkyl)amino or C.sub.1 -C.sub.4 alkyl.Type: GrantFiled: November 5, 1982Date of Patent: April 2, 1985Assignee: Ciba Geigy CorporationInventors: Hans-Georg Brunner, Rolf Schurter, Henry Szczepanski
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Patent number: 4505743Abstract: There are described novel .alpha.-[4-(3'-fluoro-5'-halopyridyl-2'-oxy)-phenoxy]-propionic acid esters and -thioesters having a herbicidal action and an action reducing the growth of grasses, which compounds correspond to the formula I ##STR1## wherein Q is oxygen or sulfur,Hal is halogen, andR is hydrogen, a metal cation, an ammonium group, an unsubstituted or substituted alkyl, cycloalkyl, alkenyl or alkynyl group, or an imino ether group --N.dbd.C R.sub.1 R.sub.2, in which R.sub.1 and R.sub.2 separately are each alkyl, or together they form a 4- or 5-membered methylene chain.These compounds are suitable for selectively controlling weeds in crops of cultivated plants, or for reducing the growth of grasses.Type: GrantFiled: December 20, 1982Date of Patent: March 19, 1985Assignee: Ciba-Geigy CorporationInventors: Rolf Schurter, Hermann Rempfler
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Patent number: 4487951Abstract: N-Phenylsulfonyl-N'-pyrimidinyl- and -triazinylureas of the general formula ##STR1## and the salts of these compounds with amines, with alkali or alkaline-earth metal bases or with quaternary ammonium bases, have good pre- and post-emergence selective, herbicidal and growth-regulating properties.The symbols in this formula are as follows:A is a C.sub.3 -C.sub.6 -alkynyl group,E is the methine group or nitrogen,X is oxygen, sulfur or a sulfinyl or sulfonyl bridge,Z is oxygen or sulfur,m is the number one or two,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl or C.sub.2 -C.sub.5 -alkenyl or a group --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or C.sub.1 -C.sub.4 -haloalkyl, or a group --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4 independently of one another are each hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.Type: GrantFiled: January 19, 1984Date of Patent: December 11, 1984Assignee: Ciba-Geigy CorporationInventors: Werner F/o/ ry, Karl Gass, Willy Meyer, Rolf Schurter
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Patent number: 4478635Abstract: The invention relates to N-arylsulfonyl-N'-pyrimidinyl ureas of the general formula ##STR1## and to the salts thereof with amines, alkali metal hydroxides or alkaline earth metal hydroxides or with quaternary ammonium bases. These compounds have good pre- and postemergence selective herbicidal and growth regulating properties.In the formula, R.sub.18 is hydrogen, alkyl or alkoxy, X is an unsubstituted or substituted phenyl radical or an unsubstituted or substituted naphthyl radical, Y is C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 haloalkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 haloalkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.2 -C.sub.3 alkoxyalkyl, halogen or an unsubstituted amino group and Z is oxygen or sulfur.Type: GrantFiled: January 3, 1983Date of Patent: October 23, 1984Assignee: Ciba-Geigy CorporationInventors: Willy Meyer, Karl Gass, Werner Topfl, Rolf Schurter, Georg Pissiotas
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Patent number: 4443243Abstract: N-Phenylsulfonyl-N'-pyrimidinyl- and -triazinylureas of the general formula ##STR1## and the salts of these compounds with amines, with alkali or alkaline-earth metal bases or with quaternary ammonium bases, have good pre- and post-emergence selective, herbicidal and growth-regulating properties.The symbols in this formula are as follows:A is a C.sub.3 -C.sub.6 -alkynyl group,E is the methine group or nitrogen,X is oxygen, sulfur or a sulfinyl or sulfonyl bridge,Z is oxygen or sulfur,m is the number one or two,R.sub.1 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl or C.sub.2 -C.sub.5 -alkenyl or a group --Y--R.sub.5,R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or C.sub.1 -C.sub.4 -haloalkyl, or a group --Y--R.sub.5, --COOR.sub.6, --NO.sub.2 or --CO--NR.sub.7 --R.sub.8,R.sub.3 and R.sub.4 independently of one another are each hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.Type: GrantFiled: July 9, 1982Date of Patent: April 17, 1984Assignee: Ciba-Geigy CorporationInventors: Werner Fory, Karl Gass, Willy Meyer, Rolf Schurter
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Patent number: 4422867Abstract: A class of herbicidal unsaturated esters of .alpha.-[4-(3',5'-dihalogeno-pyridyl-2'-oxy)-phenoxy]-propionic and -thiolpropionic acid of the formula ##STR1## wherein Hal is chlorine or bromine, X is oxygen or sulfur, and R is an unsubstituted or halogenated aliphatic or alicyclic radical which may contain nitrogen, and which posseses at least one double and/or triple bond, with the proviso that if X is oxygen, R is not an unsubstituted alkenyl radical. These new esters are useful for selective post-emergent control of grassy weeds in cultivated plants such as wheat, barley, rice and soybean.Type: GrantFiled: July 2, 1981Date of Patent: December 27, 1983Assignee: Ciba-Geigy CorporationInventors: Beat Bohner, Hermann Rempfler, Rolf Schurter