Patents by Inventor Carl R. Preddy

Carl R. Preddy 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).

  • High speed radiographic film and imaging assembly
    Patent number: 6361918
    Abstract: High speed and high contrast radiographic films can be imaged in radiographic imaging assemblies comprising intensifying screens. These films having a tabular silver halide emulsions on each side of a film support. At least one emulsion comprises a rhodium dopant and has higher photographic speeds than the other emulsions despite the fact that the emulsion grains have a small average thickness of from about 0.09 to about 0.11 &mgr;m.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: March 26, 2002
    Assignee: Eastman Kodak Company
    Inventors: Robert E. Dickerson, Carl R. Preddy
  • Silver halide emulsions containing fused dihydropyrimidines
    Patent number: 5482825
    Abstract: A method of making a silver halide emulsion comprising precipitating and chemically sensitizing the emulsion and further comprising adding to the emulsion a fused dihydropyrimidine compound represented by the following formula: ##STR1## wherein X is O, S or Se; R is a substituted or unsubstituted alkyl or aryl group; andZ contains the atoms necessary to form an aromatic group, a heteroaromatic group or a heterocyclic group and a silver halide emulsion made by this method.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: January 9, 1996
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Carl R. Preddy, Xin Wen
  • Supersensitizing bis-benzothiazolocyanine dye combination for red sensitive silver halide emulsions
    Patent number: 5464735
    Abstract: There is disclosed a photographic element comprising a layer of a silver halide emulsion containing a sensitizing combination of first and second cyanine red spectral sensitizing dyes according to structure I: ##STR1##
    Type: Grant
    Filed: December 7, 1993
    Date of Patent: November 7, 1995
    Assignee: Eastman Kodak Company
    Inventors: Carl R. Preddy, John V. Holtzclaw
  • Photographic sensitivity increasing alkynylamine compounds and photographic elements
    Patent number: 5413905
    Abstract: The present invention relates to water soluble photographic sensitivity increasing alkynylamine compounds. It also relates to photographic elements containing such compounds.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: May 9, 1995
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Carl R. Preddy, John W. Harder
  • Photographic elements containing alkynylamine dopants
    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