Eastman-kodak Company

Heinz E Stapelfeldt

Seshadri Jagannathan

Paul T Hahm

Jess B Hendricks, Iii

Ramesh Jagannathan

Rajesh Vinodrai Mehta

Jerzy A Budz

Tommie L Royster, Jr

Walter Harold Isaac

Benjamin T Chen

Michael G Antoniades

Donald Robert Irwin

Sucheta Tandon

Katrin I Parsiegla

Douglas E Singer

Harold G Judd

David G Juhas

Jess Byrd Hendricks

A mixer for preparing silver halide grains for photographic use has upper and lower impellers housed in a draft tube. The bottom impeller has flat blades for micromixing silver and halide reactants introduced into the bottom of the draft tube. The upper impeller has pitched blades for macromixing the bulk fluid. The impellers are spaced apart at least the distance of their diameters so that the upper and lower impellers operate independently of one another so that micromixing is independent of macromixing. A flow disrupter structurally associated with the draft tube and positioned above the top impeller prevents vortexing of the fluid during mixing. Baffles may be provided in the draft tube to discourage vortexing.

Scalable impeller apparatus for preparing silver halide grains

Process for the preparation of high chloride emulsions containing iodide

A dimethylamine silver chloride complex is used as a single source precursor for nucleation of silver chloride crystals.

Preparation and use of a dimethylamine silver chloride complex as a

The invention is directed to a process for preparation of a silver halide emulsion comprising providing an unsensitized emulsion, heating to carry out chemical sensitization of said emulsion, cooling said emulsion, heating said emulsion a second time to complete heat treatment.

Process for preparation of silver halide emulsion employing a double

The invention generally relates to a method of silver halide grain finishing comprising providing a high chloride silver halide grain emulsion and adding a silver bromide fine grain Lippmann emulsion during the chemical sensitization heat cycle for each grain wherein said fine grain emulsion has a photographically useful compound adhered to said fine grain Lippmann emulsion.

Fine grain bromide emulsions as carriers for photographically useful

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Pittsford, NY, United States of America

Heinz E Stapelfeldt