Patents by Inventor David C. K. Chan

David C. K. Chan 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: 4728669
    Abstract: 3-(N-acyl-N-arylamino)-gamma-butyrolactones and thiobutyrolactones have fungicidal activity.
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: March 1, 1988
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4652556
    Abstract: Compounds of the formula: ##STR1## wherein R is aryl of 6 to 12 carbon atoms or aralkyl of 7 to 14 carbon atoms either optionally substituted with 1 to 3 substituents independently selected from lower alkyl of 1 to 6 carbon atoms, lower alkoxy of 1 to 6 carbon atoms, lower alkylthio of 1 to 6 carbon atoms, lower alkylsulfinyl of 1 to 6 carbon atoms, lower alkylsulfonyl of 1 to 6 carbon atoms, halogen, trihalomethyl, nitro, cyano or carboxyl; alkyl of 1 to 10 carbon atoms, cycloalkyl of 3 to 10 carbon atoms, lower alkenyl of 2 to 6 carbon atoms, or lower alkynyl of 2 to 6 carbon atoms, all optionally substituted with 1 to 3 halogen atoms; lower alkoxyalkylene; lower alkylene carbalkoxy; lower alkylthioalkylene; lower alkylsulfinylalkylene; or lower alkylsulfonylalkylene; R.sup.1 and R.sup.2 are independently hydrogen, lower alkyl of 1 to 6 carbon atoms, aryl of 6 to 12 carbon atoms, or thienyl, or taken together form an alkylene bridge to give a cycloalkyl group of 3 to 10 carbon atoms; and R.sup.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: March 24, 1987
    Assignee: Chevron Research Company
    Inventors: Joseph E. Moore, Yuh-Lin Yang, Robert K. Griffith, David C. K. Chan
  • Patent number: 4648897
    Abstract: Compounds of the formula ##STR1## wherein Ar is aryl, R.sup.1 is halomethyl, R.sup.2 is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, haloalkyl, alkylthio, alkenylthio, alkynylthio, aryl or NR.sup.5 R.sup.6 wherein R.sup.5 and R.sup.6 individually are hydrogen, alkyl, alkenyl or alkynyl, R.sup.3 is hydrogen or alkyl, n is 1 or 2, Y is O, S or NR wherein R is hydrogen, alkyl, alkenyl or alkynyl, have been found to be useful herbicides. The compounds are prepared by acylation of the corresponding N-heterocyclealkylene-N-arylamine.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: March 10, 1987
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4599351
    Abstract: 3-(N-butyryl or valeryl-N-arylamino)-gamma-butyrolactones and their thio analogs. These compounds are useful as fungicides.
    Type: Grant
    Filed: February 1, 1984
    Date of Patent: July 8, 1986
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4579856
    Abstract: Compounds of the formula: ##STR1## wherein X is oxygen or sulfur; Z is oxygen or sulfur; R is pyridyl optionally substituted with 1 to 3 substituents independently selected from halogen, lower alkyl or lower alkoxy optionally substituted with 1 to 3 of the same or different halogen atoms or nitro; R.sup.1 is lower alkyl; and R.sup.2 is a 5- or 6-membered heterocyclic ring containing 1 to 3 ring nitrogens and the remainder of the ring atoms carbon atoms, a quinoline ring or a phenyl ring, all optionally substituted with 1 to 3 substituents independently selected from halogen, trihalomethyl, lower alkyl or lower alkoxy are fungicidal.
    Type: Grant
    Filed: September 23, 1983
    Date of Patent: April 1, 1986
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4544661
    Abstract: Compounds of the formula: ##STR1## wherein X is oxygen or sulfur;R is pyridyl optionally substituted with 1 to 3 substituents independently selected from halogen, lower alkyl or lower alkoxy optionally substituted with 1 to 3 of the same or different halogen atoms or nitro, R.sup.1 is lower alkyl; and R.sup.2 is a 5- or 6-membered heterocyclic ring containing 1- to 3-ring nitrogens and the remainder of the ring atoms carbon atoms, a quinoline ring or a phenyl ring, all optionally substituted with 1 to 3 substituents independently selected from halogen, trihalomethyl, lower alkyl or lower alkoxy, provided that R.sup.2 is not bonded to the --CH.sub.2 -- group by a ring nitrogen and compatible salts thereof, are fungicidal.
    Type: Grant
    Filed: September 23, 1983
    Date of Patent: October 1, 1985
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4494978
    Abstract: N-(N'-hydrocarbyloxycarbamylalkyl)-2,6-dialkyl-alpha-haloacetanilides have herbicidal activity, particularly in preemergent applications.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: January 22, 1985
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4468247
    Abstract: Salts, esters, amides, hydrazides and hydroxyamides of 4-methyl-4-[3'-(4"-trifluoromethylphenoxy)-phenoxy]crotonic acid are herbicidal against broad leaf plants.
    Type: Grant
    Filed: June 22, 1982
    Date of Patent: August 28, 1984
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4460603
    Abstract: N-[1-(2'-substituted-alkyl)-amidomethyl and carboalkoxymethyl]-substituted-N-acylanilines have fungicidal activity.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: July 17, 1984
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4460399
    Abstract: N-(2-[4-(4-trifluoromethylphenoxy)-phenoxy]propyl)-N-methylformamide. The base compound is prepared via formylation of the corresponding amine intermediate. The compounds are useful as fungicides, herbicides and plant-growth regulators and especially as cotton defoliants or desiccants.
    Type: Grant
    Filed: January 26, 1982
    Date of Patent: July 17, 1984
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4440780
    Abstract: 3-(N-acyl-N-arylamino) and 3-(N-thionoacyl-N-arylamino)-gamma-butyrolactones and thiobutyrolactones have fungicidal activity.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: April 3, 1984
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4414017
    Abstract: Compounds of the formula ##STR1## wheren X.sup.1 is halo or trihalomethyl, X.sup.2 is hydrogen or halo, R.sup.1 is nitro or --OR.sup.3, R.sup.2 is hydrogen or --OR.sup.4, R.sup.3 ##STR2## R.sup.4 is ##STR3## and R is hydroxy, alkoxy, alkenoxy, alkynoxy, thiol, alkythio, alkenylthio, amino, mono- or di-substituted amino or OM, wherein M is a monovalent cation; R' and R" are hydrogen, alkyl, alkenyl, alkynyl or phenyl; and Y is oxygen, sulfur, or substituted or unsubstituted nitrogen, have herbicidal activity.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: November 8, 1983
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4407817
    Abstract: 3-(N-acyl-N-arylamino) and 3-(N-thionoacyl-N-arylamino)-gamma-butyrolactones and thiobutyrolactones have fungicidal activity.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: October 4, 1983
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4382954
    Abstract: Compounds represented by the formula ##STR1## wherein R and R.sup.1 are independently hydrogen or lower alkyl; R.sup.2 is lower alkenyl, lower alkynyl or --CH.sub.2 X wherein X is halogen, hydroxyl, lower alkoxy, lower alkylthio or a furanyl ring; and Z is hydroxyl, lower alkoxy or --NR.sup.3 R.sup.4 wherein R.sup.3 and R.sup.4 are independently hydrogen or lower alkyl possess fungicidal activity. Moreover, some of the compounds of this invention also possess herbicidal activity.
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: May 10, 1983
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4350831
    Abstract: Mites and mite eggs are killed with an N-tetrachloroethylthio-substituted sulfonamide of the formula ##STR1## wherein R is alkyl, alkenyl, cycloalkyl or aryl, R.sup.1 is alkyl, alkenyl, cycloalkyl or aryl, and R.sup.2 is tetrachloroethyl, with the proviso that R and R.sup.1 are not both cycloalkyl or aryl.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: September 21, 1982
    Assignee: Chevron Research Company
    Inventors: David C. K. Chan, Arthur A. Whipp
  • Patent number: 4326077
    Abstract: Novel N-haloacetylphenylamino carbonyl oximes represented by the formula ##STR1## wherein Ar is phenyl or substituted phenyl; R.sup.1 is halomethyl; R.sup.2 and R.sup.3 are each independently hydrogen, alkyl, phenyl, benzyl, substituted phenyl or benzyl, haloalkyl, cyanoalkyl, alkoxyalkyl, alkylthioalkyl or thiocyanoalkyl; R.sup.4 is hydrogen or alkyl; n is 0 or 1; m is 0 or 1; R is hydrogen, alkyl, alkenyl, alkynyl, alkylthioalkyl, haloalkyl, alkoxyalkyl, cyanoalkyl, phenyl, benzyl, substituted phenyl or benzyl, or R is acyl of the formula ##STR2## wherein R.sup.5 is hydrogen, alkyl, haloalkyl, alkoxyalkyl, alkylthioalkyl, alkoxy, alkylthio, acetonyl, or the group --NR'R" wherein R' and R" are independently hydrogen, alkyl or phenyl; with the proviso that R.sup.2 and R.sup.3 may be joined together to form a carbocyclic ring or a heterocyclic ring; or R and R.sup.2 may be joined together to form a heterocyclic ring; or R and R.sup.3 may be joined together to form a heterocyclic ring.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: April 20, 1982
    Assignee: Chevron Research Company
    Inventors: William L. Schinski, David C. K. Chan, Irene C. Huang
  • Patent number: 4310463
    Abstract: 3-(N-arylamino)-gamma-butyrolactones, butyrolactams and thiobutyrolactones are intermediates for compounds having fungicidal activity.
    Type: Grant
    Filed: August 17, 1979
    Date of Patent: January 12, 1982
    Assignee: Chevron Research
    Inventor: David C. K. Chan
  • Patent number: 4283416
    Abstract: Fungi, mites and mite eggs are killed by applying thereto sulfonamides of the formula ##STR1## wherein R and R.sup.1 individually are alkyl, cycloalkyl, aryl, carbamylalkyl, or alkoxycarbonylalkyl and R.sup.2 is haloalkyl, with the proviso that one R or R.sup.1 group is carbamylalkyl or alkoxycarbonylalkyl.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: August 11, 1981
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan
  • Patent number: 4269856
    Abstract: Mites and mite eggs are killed with an N-tetrachloroethylthio-substituted sulfonamide of the formula ##STR1## wherein R is alkyl, alkenyl, cycloalkyl or aryl, R.sup.1 is alkyl, alkenyl, cycloalkyl or aryl, and R.sup.2 is tetrachloroethyl, with the proviso that R and R.sup.1 are not both cycloalkyl or aryl.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: May 26, 1981
    Assignee: Chevron Research Company
    Inventors: David C. K. Chan, Arthur A. Whipp
  • Patent number: 4269849
    Abstract: 3-(N-cycloalkylcarbonyl-N-arylamino)-gamma-butyrolactones, thiobutyrolactones and butyrolactams have fungicidal activity.
    Type: Grant
    Filed: December 12, 1979
    Date of Patent: May 26, 1981
    Assignee: Chevron Research Company
    Inventor: David C. K. Chan