Patents by Inventor Philip T. S. Lau

Philip T. S. Lau 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).

  • Cyan dye-forming couplers
    Patent number: 4333999
    Abstract: Novel phenolic cyan dye-forming couplers contain in the 2-position a p-cyanophenylureido group. These couplers are useful in photographic emulsions, elements and processes.
    Type: Grant
    Filed: July 10, 1980
    Date of Patent: June 8, 1982
    Assignee: Eastman Kodak Company
    Inventor: Philip T. S. Lau
  • Photographic emulsions, elements and processes utilizing release compounds
    Patent number: 4248962
    Abstract: Photographic couplers which release a photographically useful group by an intramolecular nucleophilic displacement reaction can be used in photographic emulsions, elements and processes to provide a photographically useful group in a controlled manner.
    Type: Grant
    Filed: December 22, 1978
    Date of Patent: February 3, 1981
    Assignee: Eastman Kodak Company
    Inventor: Philip T. S. Lau
  • Silver halide emulsions containing yellow-dye-forming couplers
    Patent number: 4157919
    Abstract: Novel bis yellow-dye-forming couplers are incorporated in photographic emulsions and elements. The couplers are represented by the structural formula ##STR1## where: R is an aryl group of 6 to 12 carbon atoms, an aryloxyalkylene or arylthioalkylene group having 6 to 12 carbon atoms in the aryl portion of the group and 1 to 4 carbon atoms in the alkylene portion of the group, or an alkyl group of 1 to 8 carbon atoms;R.sup.1 is an alkyl group of 4 to 16 carbon atoms;R.sup.2 represents one or more halogen, lower alkyl, lower alkoxy, carboxy or lower alkoxycarbonyl substituents wherein the alkyl group and the alkyl portion of the alkoxy and alkoxycarbonyl groups contain 1 to 6 carbon atoms; andX is sulfonyl, carbonyl or alkylenedisulfonamido containing 1 to 4 carbon atoms.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: June 12, 1979
    Assignee: Eastman Kodak Company
    Inventor: Philip T. S. Lau
  • Silver halide emulsions with incorporated 4,6-difluorophenolic couplers
    Patent number: 3998642
    Abstract: Color photographic elements are disclosed having, incorporated therein, one or more novel phenolic materials which have the following structure: ##STR1## wherein R.sub.1 is a non-interfering alkyl, aryl, amino, substituted alkyl or substituted aryl ballasting group of the type which is useful in photographic incorporated cyan color-forming couplers, and R.sub.2 is hydrogen or a lower alkyl group.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: December 21, 1976
    Assignee: Eastman Kodak Company
    Inventors: Philip T. S. Lau, Roy L. Orvis, Thomas E. Gompf
  • Yellow-dye-forming couplers
    Patent number: T984005
    Abstract: novel bis yellow-dye-forming couplers are incorporated in photographic emulsions and elements. The couplers are represented by the structural formula ##STR1## where: R is an aryl group of 6 to 12 carbon atoms, an aryloxyalkylene or arylthioalkylene group having 6 to 12 carbon atoms in the aryl portion of the group and 1 to 4 carbon atoms in the alkylene portion of the group, or an alkyl group of 1 to 8 carbon atoms;R.sup.1 is an alkyl group of 4 to 16 carbon atoms;R.sup.2 represents one or more halogen, lower alkyl, lower alkoxy, carboxy or lower alkoxycarbonyl substituents wherein the alkyl group and the alkyl portion of the alkoxy and alkoxycarbonyl groups contains 1 to 6 carbon atoms; andX is sulfonyl, carbonyl or alkylenedisulfonamido containing 1 to 4 carbon atoms.
    Type: Grant
    Filed: December 18, 1978
    Date of Patent: July 3, 1979
    Assignee: Eastman Kodak Co.
    Inventor: Philip T. S. Lau
  • Cyan dye-forming couplers
    Patent number: T101601
    Abstract: Novel phenolic cyan dye-forming couplers contain in the 2-position a p-cyanophenylureido group. These couplers are useful in photographic emulsions, elements and processes.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: March 2, 1982
    Inventor: Philip T. S. Lau