Patents by Inventor Richard K. Rothrock

Richard K. Rothrock 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).

  • Patent number: 7338756
    Abstract: A process for making a direct dispersion of a photographically useful material comprising: mixing (i) an aqueous phase and (ii) a liquid organic phase under conditions of shear or turbulence to form a dispersion of the organic phase dispersed in the aqueous phase; wherein the liquid organic phase comprises one or more photographically useful materials and one or more organic solvents having a boiling point of at least 150° C., a molecular weight less than or equal to 300, and a solvatochromic parameter ? value greater than or equal to 0.50, wherein the weight ratio of the sum of the solvents having a boiling point of at least 150° C., a molecular weight less than or equal to 300, and a solvatochromic parameter ? value greater than or equal to 0.50 to the photographically useful materials does not exceed 0.25.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: March 4, 2008
    Assignee: Eastman Kodak Company
    Inventors: Paul L. Zengerle, Richard K. Rothrock, Jerrold N. Poslusny, Stephen P. Singer, Peter P. Garrisi, Paul B. Merkel
  • Patent number: 6680165
    Abstract: The invention provides a color negative photographic element comprising a light sensitive silver halide emulsion imaging layer having associated therewith a cyan dye-forming coupler dispersion comprising a first 2-ureido-5-acylamino substituted phenolic cyan dye-forming coupler [P], a second phenolic cyan dye-forming coupler [AP] where the 2-substituent is other than an ureido group, a substantially non-color-developable phenolic activator compound [ACT], and a non-phenolic organic coupler solvent having a boiling point of at least 150C; wherein compounds represented by [P], [AP], and [ACT] are present in the coupler dispersion in relative weight fractions of from 0.30 to 0.65 for [P], from 0.15 to 0.35 for [AP], and from 0.15 to 0.
    Type: Grant
    Filed: October 24, 2002
    Date of Patent: January 20, 2004
    Assignee: Eastman Kodak Company
    Inventors: Jerrold N. Poslusny, Paul B. Merkel, David A. Steele, Drake M. Michno, David S. Ross, Richard K. Rothrock, Paul L. Zengerle
  • Patent number: 5342746
    Abstract: A silver halide light-sensitive photographic element comprising a support and provided thereon a plurality of light-sensitive layers including a green-sensitive layer comprising a dispersion of particles in a hydrophilic colloid, the particles comprising a pyrazolazole dye forming coupler dissolved in a coupler solvent comprising a long chain unsaturated alcohol.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: August 30, 1994
    Assignee: Eastman Kodak Company
    Inventors: Paul L. Zengerle, Richard K. Rothrock, Chris Johnson