Patents by Inventor John P. Freeman

John P. Freeman 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).

  • Cyclic dichalcogenide fog inhibiting agents for silver halide photography
    Patent number: 4861703
    Abstract: Radiation-sensitive silver halide photographic elements are disclosed which are protected against fog by cyclic dichalcogenides. A new cyclic oxaspiro ditelluride is disclosed.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: August 29, 1989
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Wolfgang H. H. Gunther, John P. Freeman
  • Photographic compositions and elements including internal latent image silver halide grains and nucleating agents therefor
    Patent number: 4737439
    Abstract: A radiation-sensitive composition including silver halide grains capable of forming an internal latent image and a nucleating agent is useful as a coating on a support to form a photographic element.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: April 12, 1988
    Assignee: Eastman Kodak Company
    Inventors: John P. Freeman, Roy L. Orvis, Richard L. Parton, Karl E. Wiegers
  • Hydrolyzed azolium speed enhancing/fog-inhibiting agents for silver halide photography
    Patent number: 4578348
    Abstract: Radiation sensitive silver halide photographic elements are disclosed which are protected from fog by hydrolyzed quaternized chalcogenazolium salts of middle chalcogens, wherein the quaternizing substituent contains a ##STR1## group in which T and T.sup.1 are carbonyl or sulfonyl and m is from 1 to 3.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: March 25, 1986
    Assignee: Eastman Kodak Company
    Inventors: John P. Freeman, Fred M. Macon, John D. Mee
  • Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
    Patent number: 4451557
    Abstract: Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus;Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms; and R.sup.1 is hydrogen or methyl.
    Type: Grant
    Filed: February 14, 1983
    Date of Patent: May 29, 1984
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, John P. Freeman, William N. Baum
  • Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
    Patent number: 4378426
    Abstract: Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is -O-, -S-, -Se-, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: March 29, 1983
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, John P. Freeman, William N. Baum
  • Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
    Patent number: T103803
    Abstract: Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## and R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.
    Type: Grant
    Filed: August 16, 1982
    Date of Patent: January 3, 1984
    Inventors: Roger Lok, John P. Freeman, William N. Baum
  • Photographic speed increasing and latent image stabilizing compounds
    Patent number: T104903
    Abstract: Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus;Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms; and R.sup.1 is hydrogen or methyl.
    Type: Grant
    Filed: February 7, 1984
    Date of Patent: December 4, 1984
    Inventors: Roger Lok, John P. Freeman, William H. Baum