Patents by Inventor John M. Kitteridge

John M. Kitteridge 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).

  • Improvements in or relating to printing plates
    Patent number: 5609987
    Abstract: A hydrophobic synthetic resin is used to partially or completely replace the hydrophilic colloid conventionally used in silver halide emulsions to obtain a radiation sensitive composition useful in the manufacture of radiation sensitive plates for use in printing plate production by image-wise exposure, tanning development, and washing. The synthetic resin includes a plurality of primary amino groups and optionally acidic groups and is soluble in aqueous or semi-aqueous alkaline solution.
    Type: Grant
    Filed: August 9, 1995
    Date of Patent: March 11, 1997
    Assignee: Du Pont (U.K.) Limited
    Inventors: John M. Kitteridge, Andrew E. Matthews, Philip J. Watkiss
  • Lithoplates of quaternary ammonium salt compositions
    Patent number: 4202699
    Abstract: A radiation sensitive composition comprises a quaternary ammonium salt and a chemical sensitizer of the formula ##STR1## wherein R.sup.21 is aryl, arylalkenyl or arylalkyl, R.sup.22 is aryl, alkyl, arylalkenyl, arylalkyl, carboxylic acid or salt, or hydrogen and X is carboxylic acid or salt. The quaternary ammonium salt is of the type which will accept at least one electron on exposure to radiation to form a substance capable of causing metal to be deposited onto said substance from an electroless plating solution in contact with said substance and comprising a salt of said metal and a reducing agent. A radiation sensitive plate comprises a metallic substrate coated with a radiation sensitive layer comprising a quaternary ammonium salt. The layer may be formed of the above composition.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: May 13, 1980
    Assignee: Vickers Limited
    Inventors: John M. Kitteridge, Robert J. Armstrong
  • Radiation sensitive compositions of quaternary ammonium salt and carboxylic acid sensitizer
    Patent number: 4126468
    Abstract: A radiation sensitive composition comprises a quaternary ammonium salt and a chemical sensitiser of the formula ##STR1## wherein R.sup.21 is aryl, arylakenyl or arylalkyl, R.sup.22 is aryl, alkyl, arylalkenyl, arylalkyl, carboxylic acid or salt, or hydrogen and X is carboxylic acid or salt. The quaternary ammonium salt is of the type which will accept at least one electron on exposure to radiation to form a substance capable of causing metal to be deposited onto said substance from an electroless plating solution in contact with said substance and comprising a salt of said metal and a reducing agent. A radiation sensitive plate comprises a metallic substrate coated with a radiation sensitive layer comprising a quaternary ammonium salt. The layer may be formed of the above composition.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: November 21, 1978
    Assignee: Vickers Limited
    Inventors: John M. Kitteridge, Robert J. Armstrong