Patents by Inventor William H. Baum

William H. 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
    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