Patents by Inventor John I. Darragh

John I. Darragh 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 4,4'-dihydroxydiphenylsulfones
    Patent number: 4125562
    Abstract: A phenol is reacted with sulphur trioxide in the presence of liquid hydrogen fluoride to form a 4,4'-dihydroxydiphenylsulphone. A molar excess of hydrogen fluoride and stoichiometric proportions of sulphur trioxide and phenol or a slight excess of sulphur trioxide over phenol are preferred.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: November 14, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: John I. Darragh, John B. Rose
  • Manufacture of pyridine and methylpyridines
    Patent number: 4073787
    Abstract: The present invention involves the manufacture of pyridine and/or methylpyridines, which comprises the catalytic vapor phase reaction of 1,3-butadiene, formaldehyde and ammonia in the presence of a gaseous diluent such as steam.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: February 14, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: John I. Darragh, Hugh S. Inglis
  • Manufacture of pyridine and methylpyridines
    Patent number: 4072684
    Abstract: The proportion of residual solvent in a solid chlorinated polymer prepared by chlorination in a chlorine-resistant solvent and subsequent treatment with steam or hot water is reduced by carrying out the said treatment in the presence of a polymer lubricant.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: February 7, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventor: John I. Darragh