Patents by Inventor David B. Oliff

David B. Oliff 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).

  • Photothermographic imaging materials and antifoggants therefor
    Patent number: 5939248
    Abstract: A photothermographic material having a photosensitive medium comprising: photosensitive silver halide, a reducible silver source, a reducing agent for silver ion, a hydrobromic acid salt of a nitrogen-containing heterocyclic ring or fused ring nucleus associated with a pair of bromine atoms CHARACTERIZED IN THAT the photosensitive medium additionally comprises as an antifoggant, substantially in the absence of an antifoggant effective amount of mercury and other heavy metal salts, a tribromomethyl ketone compound of general formula (I): ##STR1## in which; R represents an alkyl group, an aryl group, a carbocyclic ring or fused ring nucleus or a heterocyclic ring or fused ring nucleus.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: August 17, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mark P. Kirk, David B. Oliff
  • Photothermographic imaging materials and sensitisers therefor
    Patent number: 5393654
    Abstract: A heptamethine cyanine dye in which both nitrogen atoms of the cyanine chromophore bear a carboxyalkyl substituent comprising an alkyl chain of at least five carbon atoms. The dyes are useful as sensitisers in photothermographic imaging materials.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: February 28, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Ronald W. Burrows, David B. Oliff, James B. Philip, Jr.