Patents by Inventor Malcolm L. Judd

Malcolm L. Judd 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).

  • Silver halide precipitation process with deletion of materials through the reaction vessel
    Patent number: 4336328
    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.
    Type: Grant
    Filed: June 11, 1981
    Date of Patent: June 22, 1982
    Assignee: Eastman Kodak Company
    Inventors: Barry M. Brown, Malcolm L. Judd, Roger N. Schindler