Patents by Inventor David Hales Bown

David Hales Bown 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 elements containing aryloxypyrazolone couplers and sulfur containing stabilizers
    Patent number: 6365334
    Abstract: A photographic element having a layer comprising a silver halide emulsion, a 1-aryl-4-aryloxy-2-pyrazolin-5-one magenta dye forming coupler, and a sulfide, sulfoxide or sulfone compound. Such elements exhibit good activity and stability of the magenta coupler. Preferably, the foregoing magenta dye forming coupler has the structure of Ia or Ib below, while the sulfide, sulfoxide and sulfone compounds have the structure VI, VII or VIII below: Where R1, R2, R3, n, R8 and R9 are defined in the specification.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: April 2, 2002
    Assignee: Eastman Kodak Company
    Inventors: Jerrold Neal Poslusny, Paul Barrett Merkel, Lawrence Glenn Anderson, Jared Ben Mooberry, David Hales Bown