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Malcolm L Judd Deceased26 Sandpiper Ln, Pittsford, NY 14534

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26 Sandpiper Ln, Pittsford, NY 14534    585-5868788   

Long Lake, NY   

26 Sandpiper Ln, Pittsford, NY 14534   

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Us Patents

Silver Halide Precipitation Process With Deletion Of Materials Through The Reaction Vessel

US Patent:
4336328, Jun 22, 1982
Filed:
Jun 11, 1981
Appl. No.:
6/272612
Inventors:
Barry M. Brown - Rochester NY
Malcolm L. Judd - Pittsford NY
Roger N. Schindler - Fairport NY
Assignee:
Eastman Kodak Company - Rochester NY
International Classification:
G03C 102
US Classification:
430569
Abstract:
An improved silver halide precipitation process of preparing a dispersion of silver halide grains is disclosed. The process comprises forming a radiation-sensitive silver halide dispersion by reacting silver and halide salts in solution within a dispersing medium to form silver halide grain nuclei within the dispersing medium and allowing silver halide grain growth to occur in a reaction vessel in which the silver halide grain nuclei and the dispersing medium are present. The improvement comprises, during silver halide grain growth, withdrawing a portion of the dispersing medium from the reaction vessel through an ultrafiltration membrane while retaining the silver halide grains within the dispersing medium remaining within the reaction vessel.

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