Patents by Inventor John Michael Buchanan

John Michael Buchanan 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).

  • Patent number: 5783376
    Abstract: A composition for bleaching or bleach-fixing a silver halide photographic material has a pH of from 2 to 9. The composition comprises a bleaching agent which is either a persulfate or polyvalent metal complex of an aminopolycarboxylic acid, and from 0.01 to 2M of a sulfo-substituted carboxylate represented by Formula I(MO.sub.3 S).sub.n --R--(COOM).sub.m (I)wherein R is a benzene ring or a straight, branched or cyclic saturated aliphatic group having 2 to 8 carbon atoms;M is hydrogen or an organic or inorganic cation; andn is 1 to 7;with the proviso that if R is an aliphatic group, m is 2 to 4 and m and n combined cannot equal more than the number of carbon atoms in R plus two, and if R is a benzene ring, m is 2 to 5 and m and n combined cannot equal more than six.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: July 21, 1998
    Assignee: Eastman Kodak Company
    Inventors: Stuart Terrance Gordon, John Michael Buchanan, Sidney Joseph Bertucci
  • Patent number: 5773202
    Abstract: A simple and effective bleaching method includes the use of a bleaching solution including a peroxide bleaching agent and chloride ion in an amount of at least 0.35 mol/l. An organic phosphonic acid or tertiary aminocarboxylic acid can also be present for stability. The method is useful for bleaching color photographic films containing at least 20 mol % silver bromide and from 0 to about 0.5 mol % silver iodide in at least one silver halide emulsion.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: June 30, 1998
    Inventors: Shirleyanne Elizabeth Haye, Terrence Robert O'Toole, David Leroy Cole, John Michael Buchanan