Patents by Inventor Wai K. Lam

Wai K. Lam 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).

  • Publication number: 20020133474
    Abstract: A method of providing photographic products and services, includes the steps of: selling a photographic film product to a customer; partially exposing the photographic film product; returning the partially exposed photographic film product to a photofinisher; and providing credit to the customer for the unexposed portion of the photographic film product.
    Type: Application
    Filed: January 22, 2001
    Publication date: September 19, 2002
    Applicant: Eastman Kodak Company
    Inventors: David E. Fenton, Wai K. Lam, Steven L. Mizelle
  • Patent number: 6322961
    Abstract: A color reversal photographic element is disclosed comprising a support having coated thereon a silver halide emulsion layer comprising a silver halide emulsion chemically sensitized in the presence of an organomercapto Au(I) complex having the formula [L—Au—L]M wherein M is a cationic counter ion and each L is an organomercapto ligand which has antifogging, stabilizing or sensitizing properties, and a rapid sulfiding agent represented by structure SS-1 wherein each of the R1, R2, R3, and R4 groups independently represents an alkylene, cycloalkylene, carbocyclic arylene, heterocyclic arylene, alkarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R1 and R2 or R3 and R4 can complete a 5- to 7-membered heterocyclic ring; and each of the B1, B2, B3, and B4 groups independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group, with th
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: November 27, 2001
    Assignee: Eastman Kodak Company
    Inventors: Wai K. Lam, Roger Lok, David W. Sandford
  • Patent number: 6043019
    Abstract: A method is disclosed of manufacturing a radiation-sensitive tabular grain emulsion comprised of (a) providing in a stirred reaction vessel a host tabular grain emulsion containing greater than 50 mole percent bromide, based on silver, and a speed enhancing amount of iodide and (b) then introducing a silver salt solution into the stirred reaction vessel, wherein (1) the silver salt solution is introduced into the stirred reaction vessel at a rate sufficient to create a new grain population, (2) halting introduction of the silver salt solution for a time sufficient to allow the new grain population to be ripened out, and (3) repeating steps (1) and (2) from 3 to 20 times until silver introduced in steps (1) and (2) amounts to from 5 to 50 percent of total silver forming the radiation-sensitive tabular grain emulsion.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: March 28, 2000
    Assignee: Eastman Kodak Company
    Inventors: Ramesh Jagannathan, Rajesh V. Mehta, Steven P. Szatynski, Wai K. Lam
  • Patent number: 5389510
    Abstract: The present invention relates to a photographic element comprising a silver halide emulsion, the emulsion comprising silver halide grains which contain an alkynylamine dopant. The presence of the alkynylamine dopant imparts to the photographic element the advantageous characteristic of increased sensitivity.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: February 14, 1995
    Assignee: Eastman Kodak Company
    Inventors: Carl R. Preddy, Wai K. Lam, Roger Lok
  • Patent number: 5380642
    Abstract: A process for preparing a thin tabular grain silver halide emulsion comprised of silver halide grains which have a halide content of at least 50 mole percent bromide, wherein tabular grains of less than 0.15 micrometers in thickness and having an aspect ratio of greater than 8 account for greater than 50 percent of the total grain projected area, comprises the steps of nucleating the silver halide grains with a gelatino-peptizer or with the use of certain synthetic polymers that serve as effective nucleation peptizers and then growing the silver halide grains with the use of either a gelatino-peptizer or certain synthetic polymers that serve as effective growth peptizers.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: January 10, 1995
    Assignee: Eastman Kodak Company
    Inventors: Michael R. Roberts, Wai K. Lam, Wayne A. Bowman, John E. Keevert, Jr., Byron H. Rubin
  • Patent number: 5364754
    Abstract: This invention provides a method of preparing a silver halide photographic emulsion which comprises adding to the silver halide emulsion before or during precipitation a non-labile chalcogen compound represented by Formula I:R.sup.1 --X.sup.1 --X.sup.2 --R.sup.2 (Formula I)It further provides a silver halide photographic emulsion prepared by the above method.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: November 15, 1994
    Assignee: Eastman Kodak Company
    Inventors: Sang H. Kim, Anthony Adin, Richard E. Beal, Jerzy A. Budz, Wai K. Lam, Mark A. Whitson