Patents by Inventor Paul A. Freeman

Paul A. Freeman 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).

  • Photographic emulsions containing methine dyes having a 1H-imidazo[4,5-b]pyrazine nucleus
    Patent number: 4007170
    Abstract: Light-sensitive photographic emulsions are provided which feature at least one methine dye containing a silver halide sensitizing 1H-imidazo[4,5-b]pyrazine nucleus.
    Type: Grant
    Filed: June 26, 1974
    Date of Patent: February 8, 1977
    Assignee: Eastman Kodak Company
    Inventors: Wilbur Seth Gaugh, Donald Warren Heseltine, David Michael Sturmer, John Paul Freeman
  • Photographic emulsions containing methine dyes having a 1H-imidazo[4,5-b]pyrazine nucleus
    Patent number: 3936308
    Abstract: Light-sensitive photographic emulsions are provided which feature at least one methine dye containing a 1H-imidazo[4,5-b]pyrazine nucleus.
    Type: Grant
    Filed: August 16, 1973
    Date of Patent: February 3, 1976
    Assignee: Eastman Kodak Company
    Inventors: Wilbur Seth Gaugh, Donald Warren Heseltine, David Michael Sturmer, John Paul Freeman