Patents by Inventor Steven D. Possanza

Steven D. Possanza 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).

  • Dry gelatin addition to an emulsion/dispersion mixture
    Patent number: 5298389
    Abstract: The present invention is a method to add dry gelatin to a photographic emulsion in either a liquid or a solid form. The dry gelatin is added by entraining the dry gelatin in air to form a gaseous mixture of dry gelatin in air and directing this mixture into the solid or liquid photographic emulsion. An air eductor is used to deliver the dry gelatin. When adding dry gelatin to a solution, the rate is determined by the solution viscosity and volume. When adding the dry gelatin to a solid emulsion, the dry gelatin rate is not as critical but uniform addition is still needed to interdisperse the dry gel with the emulsion pellets.
    Type: Grant
    Filed: September 29, 1992
    Date of Patent: March 29, 1994
    Assignee: Eastman Kodak Company
    Inventors: Steven D. Possanza, Donald E. Eaton, Lawrence D. Meston, Edgar P. Lougheed