Patents by Inventor William N. Baum

William N. Baum 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).

  • 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