Patents by Inventor Hendrik C. Kelderman

Hendrik C. Kelderman 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).

  • 2-[2-(2,2-Dihalovinyl)-3,3-dimethylcyclopropyl ]vinyl alkanoates
    Patent number: 4298757
    Abstract: 2-(2,2-Dihalovinyl-3,3-dimethylcyclopropyl)vinyl alkanoates in which the alkanoate moiety contains from two to six carbon atoms are new chemical compounds useful as intermediates in the preparation of certain pyrethroid acids. The alkanoates are prepared by reacting 2-(2,2-dihalovinyl-3,3-dimethylcyclopropyl)ethanal with the appropriate alkanoic acid anhydride.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: November 3, 1981
    Assignee: Shell Oil Company
    Inventors: Johannes Van Berkel, Hendrik C. Kelderman
  • 2,2-Dimethylcyclopropanecarbaldehyde dimethyl acetal derivatives
    Patent number: 4258205
    Abstract: New 2,2-dimethylcyclopropanecarbaldehyde dimethyl acetal derivatives of the formula ##STR1## wherein X is --CH.sub.2 OC(O)CH.sub.3, --CH.sub.2 OH, or --CHO are useful chemical intermediates for the preparation of pesticidally active cyclopropanecarboxylates.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: March 24, 1981
    Assignee: Shell Oil Company
    Inventors: Johannes Van Berkel, Hendrik C. Kelderman
  • Cyclopropane derivatives
    Patent number: 4234512
    Abstract: 2-(2,2-Dimethoxyethyl-3,3-dimethylcyclopropanecarbaldehyde and 2-[2-(2,2-dihalovinyl)-3,3-dimethylcyclopropyl]ethanal dimethyl acetals are new pyrethroid intermediates. They are prepared from 2-(2-hydroxymethyl-3,3-dimethylcyclopropyl)ethanal dimethyl acetal.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: November 18, 1980
    Assignee: Shell Oil Company
    Inventors: Johannes Van Berkel, Hendrik C. Kelderman
  • 2-(2,2-Dihalovinyl)-3,3-dimethylcyclopropanecarbaldehyde dimethyl acetal
    Patent number: 4230891
    Abstract: New 2-(2,2-dihalovinyl)-3,3-dimethylcyclopropane derivatives of the formula ##STR1## wherein each Hal is a halogen atom and R is dimethoxyethyl, 2-acetyl-3-oxobutyl, 2-methoxycarbonylpropyl or 2-acetyl-2-hydroxy-3-oxobutyl, are useful chemical intermediates for the preparation of pesticidally active cyclopropanecarboxylates.
    Type: Grant
    Filed: December 5, 1978
    Date of Patent: October 28, 1980
    Assignee: Shell Oil Company
    Inventors: Pieter A. Verbrugge, Petrus A. Kramer, Johannes Van Berkel, Hendrik C. Kelderman
  • 2-(2,2-Dihalovinyl-3,3-dimethylcyclopropyl)ethanal
    Patent number: 4222964
    Abstract: 2-(2,2-Dihalovinyl-3,3-dimethylcyclopropyl)ethanal is a new chemical compound and useful intermediate in the preparation of certain pyrethroid esters. It is prepared by hydrolysis of 2-[2-(2,2-dihalovinyl)-3,3-dimethylcyclopropyl]ethylidene diacetate, preferably in the presence of an acid.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: September 16, 1980
    Assignee: Shell Oil Company
    Inventors: Johannes Van Berkel, Johannes L. M. Syrier, Hendrik C. Kelderman