Patents by Inventor Graham Whittaker

Graham Whittaker 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).

  • Process for preparing chloro-trifluoromethyl pyridines
    Patent number: 4448967
    Abstract: 3-Chloro-5-trifluoromethylpyridine and/or 2,3-dichloro-5-trifluoromethylpyridine are produced by selective vapor-phase chlorination of 3-trifluoromethylpyridine or 2-chloro-5-trifluoromethylpyridine in the presence of a copper catalyst.
    Type: Grant
    Filed: August 20, 1982
    Date of Patent: May 15, 1984
    Assignee: Imperial Chemical Industries PLC
    Inventor: Graham Whittaker
  • Production of 3-trichloromethyl- and 3-trifluoromethyl-pyridines
    Patent number: 4429132
    Abstract: 3-Trichloromethylpyridines are produced from 3-methylpyridines by reaction with chlorine in the vapor phase in the presence of a metal oxide or metal halide catalyst.
    Type: Grant
    Filed: April 27, 1982
    Date of Patent: January 31, 1984
    Assignee: Imperial Chemical Industries PLC
    Inventor: Graham Whittaker
  • Preparation of 2-chloro-5-trifluoromethylpyridine and 2-chloro-5-perchlorofluoromethylpyridines
    Patent number: 4288600
    Abstract: 2-Chloro-5-trifluoromethylpyridine or a 2-chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the vapor phase at a temperature in the range from 100.degree. C. to 500.degree. C.
    Type: Grant
    Filed: April 22, 1980
    Date of Patent: September 8, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Norman L. Roberts, Graham Whittaker
  • Liquid phase preparation of 2-chloro-5-trifluoromethylpyridine and 2-chloro-5-perchlorofluoromethylpyridine
    Patent number: 4284783
    Abstract: 2-chloro-5-trifluoromethylpyridine or a 2-chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the liquid phase in the presence of ultra-violet radiation and/or in the presence of a free-radical initiator.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: August 18, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Graham Whittaker, Anne O'Brien
  • Halogenation of pyridine compounds
    Patent number: 4259496
    Abstract: Side-chain fluorination of 3-methylpyridine is carried out by reaction with hydrogen fluoride and chlorine in the liquid phase. The main products are 3-trifluoromethylpyridine, 3-chlorodifluoropyridine and 3-difluoromethylpyridine.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: March 31, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventor: Graham Whittaker
  • Liquid phase preparation of 2-chloro-5-trifluoromethylpyridine and 2-chloro-5-perchlorofluoromethylpyridine
    Patent number: 4257857
    Abstract: 2-Chloro-5-trifluoromethylpyridine or a 2-Chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the liquid phase in the presence of ultra-violet radiation and/or in the presence of a free-radical initiator.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: March 24, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Graham Whittaker, Anne O'Brien
  • Process for the preparation of a perfluorinated cyclic ether
    Patent number: 4231849
    Abstract: An inert fluid of high chemical stability which comprises a perfluorinated cyclic ether having the formula C.sub.10 F.sub.20 O, and its preparation by perfluorination of the corresponding ethylenically-unsaturated cyclic ether C.sub.10 F.sub.18 O with cobalt trifluoride, electrochemically or with fluorine gas.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: November 4, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Hutchinson, Graham Whittaker