Patents by Inventor John Reginald Case

John Reginald Case 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).

  • Manufacture of 1,1'-dialkyl-4,4'-bipyridylium salts
    Patent number: 4052405
    Abstract: A 1,1'-dialkyl-4,4'-bipyridylium salt is prepared from the corresponding 4,4'-bipyridyl using an alkylsulphate salt as the quaternizing agent.
    Type: Grant
    Filed: May 7, 1973
    Date of Patent: October 4, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Reginald Case, Geoffrey James Moore
  • Manufacture of 1,1'-dialkyl-4,4'-bipyridylium salts
    Patent number: 3946023
    Abstract: A 1,1'-dialkyl-4,4'-bipyridylium salt is prepared by reacting the corresponding 4,4'-bipyridyl with a diloweralkylsulphate in the presence of a mineral acid.
    Type: Grant
    Filed: March 11, 1975
    Date of Patent: March 23, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Reginald Case, Geoffrey James Moore