Patents by Inventor Norman L. Roberts

Norman L. Roberts 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).

  • Preparation of 2-chloro-5-trifluoromethylpyridine and 2-chloro-5-perchlorofluoromethylpyridines
    Patent number: 4393214
    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: March 13, 1981
    Date of Patent: July 12, 1983
    Assignee: Imperial Chemical Industries PLC
    Inventors: Norman L. Roberts, Graham Whitaker
  • 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