Patents by Inventor Loren T. Finnicum

Loren T. Finnicum 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).

  • Process for photographic emulsion precipitation in a recycle stream
    Patent number: 4147551
    Abstract: A process for preparing a photographic emulsion having a controlled grain size, structure and size distribution, wherein precipitation of first silver halide grains is accomplished in a stream, and partial substitution in the first silver halide grains of a second soluble halide is accomplished in a vessel by halide conversion to form mixed crystal silver halide grains. The initially formed mixed crystal silver halide grains are recycled in the stream wherein additional precipitation of the first silver halide occurs on the surfaces of the mixed crystals, which are enlarged. The enlarged crystals are fed from the recycle stream to a vessel wherein additional substitution by halide conversion is accomplished.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: April 3, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Loren T. Finnicum, Stanley H. Munger, Donald P. Novak