Patents by Inventor Charles E. Whitten

Charles E. Whitten 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).

  • Method of preparing 5-alkyl-1-(2-pyridinyl)-1H-1,2,4-triazol-3-ols
    Patent number: 4946959
    Abstract: 5-Alkyl-1-(2-pyridinyl)-1H-1,2,4-triazol-3-ols are prepared in good yield by reacting an appropriate 1-acyl-1-(2-pyridinyl)-semicarbazide with a base in the presence of a non-nucleophilic solvent. The compounds so prepared are intermediates used in the preparation of insecticides. The starting semicarbazide materials are novel compounds.
    Type: Grant
    Filed: July 13, 1989
    Date of Patent: August 7, 1990
    Assignee: The Dow Chemical Company
    Inventors: Charles E. Whitten, R. Garth Pews
  • 1-acyl-1-(2-pyridinyl)semicarbazides
    Patent number: 4681943
    Abstract: 5-Alkyl-1-(2-pyridinyl)-1H-1,2,4-triazol-3-ols are prepared in good yield by reacting an appropriate 1-acyl-1-(2-pyridinyl)-semicarbazide with a base in the presence of a non-nucleophilic solvent. The compounds so prepared are intermediates used in the preparation of insecticides. The starting semicarbazide materials are novel compounds.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: July 21, 1987
    Assignee: The Dow Chemical Company
    Inventors: Charles E. Whitten, R. Garth Pews
  • Chemical process
    Patent number: 4582940
    Abstract: There is described a method for synthesizing 3-nitro-1,2-cyclopentanedione salts which are substituted in the 4-position with an alkyl substituent and in the 5-position with an electron withdrawing substituent. The method comprises the addition and spontaneous cyclization reaction of a nitro olefin with a pyruvate anion. The salts can be converted to the nitro diones or used as intermediates in the preparation of amino reductones.
    Type: Grant
    Filed: December 31, 1980
    Date of Patent: April 15, 1986
    Assignee: Polaroid Corporation
    Inventor: Charles E. Whitten
  • Process for processing silver halide developing agents
    Patent number: 4153631
    Abstract: A process for preparing a silver halide developing agent of the formula: ##STR1## where R.sup.1 can be the same or different substituent which will not impair the functionality of the compound as a silver halide developing agent. Specific substituents include hydrogen, alkyl radicals and alkoxy radicals among others. The silver halide developing agents are known as "ligand developers" and are particularly useful in diffusion transfer photographic products and processes.
    Type: Grant
    Filed: April 5, 1977
    Date of Patent: May 8, 1979
    Assignee: Polaroid Corporation
    Inventors: Henry Bader, Charles E. Whitten