Patents by Inventor Philip T. Lau

Philip T. 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).

  • Patent number: 6458521
    Abstract: The invention provides a color photographic element that contains a coupler useful for forming a neutral silver-based image. Such couplers are particularly useful to provide an auxiliary silver-based image for optically recording a sound track in color motion picture films.
    Type: Grant
    Filed: November 14, 2000
    Date of Patent: October 1, 2002
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Stephen P. Singer, Janet N. Younathan, Jerrold N. Poslusny, Susan D. Hill, Anabisdally I. Bodden
  • Patent number: 6136522
    Abstract: A silver halide photographic element comprising a support bearing a light sensitive silver halide emulsion layer and a cyclic azole dye forming coupler associated with a stabilizer combination comprising i) a compound having the following Formula S: ##STR1## and, ii) a compound having the following Formula I: ##STR2## wherein: R.sub.3 represents an aryl group or a heterocyclic group;Z.sub.1 and Z.sub.2 each represent an alkylene group having 1 to 3 carbon atoms provided that the total number of carbon atoms in the ring is 3 to 6;n is an integer of 1 or 2;R.sub.4 and R.sub.5 each independently represents a hydrogen atom or an alkyl or aryl group;W represents an alkyl or aryl group.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: October 24, 2000
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Stanley W. Cowan
  • Patent number: 6048680
    Abstract: Silver halide photographic element comprising a support bearing a light sensitive silver halide emulsion layer and a cyclic azole dye forming coupler associated with a stabilizer combination comprising:i) a compound having the following Formula S: ##STR1## and ii) a compound having the following Formula I: ##STR2## wherein: R.sub.3 represents an aryl group or a heterocyclic group;Z.sub.1 and Z.sub.2 each represent an alkylene group having 1 to 3 carbon atoms provided that the total number of carbon atoms in the ring is 3 to 6;n is an integer of 1 or 2;L represents a divalent linking group;R.sub.4 represents an alkyl, alkenyl or aryl group;w represents an integrer of 1 to 5;y represents 0 or 1provided that if w is more than 1, then the --L.sub.y R.sub.4 groups may be the same or different, and two --L.sub.y R.sub.4 groups may be joined to form a ring; and that the total number of carbon atoms in --L.sub.y R.sub.4 is at least 8.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: April 11, 2000
    Assignee: Eastman Kodak Company
    Inventors: Franklin D. Saeva, Daniel L. Kapp, Stanley W. Cowan, Philip T. Lau, Michael W. Fichtner
  • Patent number: 6004738
    Abstract: The invention provides a photographic element comprising a light sensitive silver halide emulsion layer containing a cyan dye-forming coupler of formula (I), a phenolic solvent of formula (II) and a bisphenol derivative compound of formula (III): wherein the substituents are as defined herein the specification.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: December 21, 1999
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Stanley W. Cowan, David Clarke, Llewellyn J. Leyshon
  • Patent number: 5965342
    Abstract: The invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a cyan dye-forming coupler having the formula: wherein R.sub.3 represents a methyl or ethyl group; R.sub.4 represents an alkyl or alkenyl group containing 8 or more carbon atoms; R.sub.5 represents an alkyl or alkenyl group containing 4 or more carbon atoms; X represents a chloro or fluoro group; Y represents a substituent group and n represents an integer from 0 to 4, provided that if n is 2 or more, then two Y groups may be joined together to form a ring; and Z represents hydrogen or a group capable of being split off by oxidized color developer. The dye formed by the coupler upon conventional processing with a p-phenylenediamine developer exhibits improved stability.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: October 12, 1999
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Stanley W. Cowan
  • Patent number: 5962198
    Abstract: A photographic element comprising a light sensitive silver halide emulsion layer having associated therewith a cyan dye forming coupler having Formula (I): ##STR1## wherein R.sub.1 represents hydrogen or an alkyl group;R.sub.2 represents a phenyl group having an electron withdrawing group having a Hammett's Sigma value greater than 0 in a position meta or para to the amido group and has no group having a Hammett's Sigma value greater than 0 in a position ortho to the amido group;n represents 1, 2, or 3;each X is located at a position of the phenyl ring meta or para to the sulfonyl group and is independently selected from the group consisting of alkyl, alkenyl, alkoxy, aryloxy, acyloxy, acylamino, sulfonyloxy, sulfamoylamino, sulfonamido, ureido, oxycarbonyl, oxycarbonylamino, and carbamoyl groups; andZ represents a hydrogen atom or a group which can be split off by the reaction of the coupler with an oxidized color developing agent.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Stanley W. Cowan, Louis J. Rossi
  • Patent number: 5842063
    Abstract: A camera and film for recording overlapping visual images and digital data is disclosed. The camera includes a structure for recording the region of a film with visible light to record a visible image in one or more record layer(s) sensitized to visible light; and a structure for recording in the region of the film with non-visible light to record digital data in one or more record layer(s) sensitized to non-visible light, whereby overlapping visual and digital data images are recorded in the same region.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: November 24, 1998
    Assignee: Eastman Kodak Company
    Inventors: Gilbert A. Hawkins, Annabel A. Muenter, Philip T. Lau, John D. Baloga
  • Patent number: 5674666
    Abstract: The invention provides a photographic element which comprises a light-sensitive silver halide emulsion layer having associated therewith a cyan dye-forming coupler having the formula: ##STR1## wherein: R.sub.1 represents an alkyl or aryl group;R.sub.2 represents an alkyl group of 2 to 4 carbon atoms;Ar represents an aryl group; andZ represents a hydrogen atom or a group capable of being split off by reaction of the coupler with an oxidized color developing agent.Such elements provide an improved cyan dye hue upon development.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: October 7, 1997
    Assignee: Eastman Kodak Company
    Inventors: Philip T. Lau, Louis J. Rossi, Stanley W. Cowan