Patents by Inventor Ian D. Entwistle

Ian D. Entwistle 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).

  • 4-hydroxycoumarin derivatives
    Patent number: 4748185
    Abstract: The invention provides 4-hydroxycoumarin compounds of general formula ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from hydrogen and halogen atoms and R represents a group of formula ##STR2## wherein one of n and n' is O, the other being 0 or 1, D represents a moiety --O--, --(CH.sub.2).sub.m -- or --O(CH.sub.2).sub.m -- where m is 1 or 2 and X represents a substituent selected from hydrogen, halogen, CN, CF.sub.3, OCF.sub.3, C.sub.1-6 alkyl and C.sub.1-6 alkoxy moieties, provided that when n is 1 and D is --OCH.sub.2 --, X may additionally represent a phenyl group, optionally substituted in the 4-position by a substituent selected from halogen, CN, CF.sub.3, OCF.sub.3, C.sub.1-6 alkyl and C.sub.1-6 alkoxy moieties; their preparation and their use as rodenticides.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: May 31, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ian D. Entwistle, Peter Boehm
  • Anti-coagulants of the 4-hydroxycoumarin type and rodenticidal compositions (baits) comprising such anti-coagulants
    Patent number: 4520007
    Abstract: Compounds having blood-anticoagulant properties of the general molecular formula: ##STR1## in which Z represents a halogen atom, preferably a chlorine atom, and n is 0, 1 or 2 and R.sup.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: May 28, 1985
    Assignee: Shell Oil Company
    Inventors: Ian D. Entwistle, Peter Boehm
  • Herbicidal esters of N-alkylpropanamides
    Patent number: 4218239
    Abstract: A racemic or (d) form of compounds of the formula ##STR1## wherein X is alkyl optionally substituted by halogen, alkylsulfonyl, or halogen; R is an alkyl group and R.sup.1 is an esterifying organic acid function, is useful as an herbicide.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: August 19, 1980
    Assignee: Shell Oil Company
    Inventor: Ian D. Entwistle
  • Reduction of carboxylic acid halides to aldehydes
    Patent number: 4211727
    Abstract: Carboxylic acid halides are reduced to the corresponding aldehydes using zinc borohydride or cadmium borohydride as the reducing agent.
    Type: Grant
    Filed: March 15, 1979
    Date of Patent: July 8, 1980
    Assignee: Shell Oil Company
    Inventors: Ian D. Entwistle, Robert A. W. Johnstone
  • Herbicidal derivatives of N-alkylpropanamides
    Patent number: 4193789
    Abstract: A racemic or (d) form of compounds of the formula ##STR1## wherein X is alkyl optionally substituted by halogen, alkylsulfonyl, or halogen; R is an alkyl group and R.sup.1 is the residue of an organic acid function, is useful as an herbicide.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: March 18, 1980
    Assignee: Shell Oil Company
    Inventor: Ian D. Entwistle
  • Herbicidal derivatives of N-alkylpropanamides
    Patent number: 4166734
    Abstract: A racemic or (d) form of compounds of the formula ##STR1## wherein X is alkyl optionally substituted by halogen, alkylsulfonyl, or halogen; R is an alkyl group and R.sup.1 is the residue of an organic acid function, is useful as an herbicide.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: September 4, 1979
    Assignee: Shell Coil Company
    Inventor: Ian D. Entwistle
  • Propanimidothioic acid derivatives
    Patent number: 4131449
    Abstract: Compounds of the formula ##STR1## wherein X is hydrogen, halogen or alkyl optionally substituted by halogen and R.sup.1 and R.sup.2 each is alkyl, or acid addition salts thereof, are useful as herbicides.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: December 26, 1978
    Assignee: Shell Oil Company
    Inventor: Ian D. Entwistle
  • Certain benzotriazole-4,7-dione derivatives
    Patent number: 3952003
    Abstract: Novel 1H-indazole-4,7-diones, benzo(d)isoxazole-4,7-diones, benzo(d)triazole-4,7-diones, and benzimidazole-4,7-diones substituted in the 5- and 6- positions, are used for the control of weeds.
    Type: Grant
    Filed: September 4, 1973
    Date of Patent: April 20, 1976
    Assignee: Shell Oil Company
    Inventors: Ian D. Entwistle, Peter J. Williams, Barry R. J. Devlin