Patents by Inventor Donald Robert Irwin

Donald Robert Irwin 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).

  • Process for making high chloride tabular grain emulsion using multiple stream addition of iodide
    Patent number: 5709989
    Abstract: The invention generally relates to a process for forming tabular silver chloride grains comprising nucleating silver chloride particles, introducing alkali iodide solution into the dispersing medium containing the nucleated silver chloride particles, and introducing silver ion and chloride ion solutions into said dispersing medium, with the proviso that introduction of the alkali iodide is by multiple streams of said alkali iodide at a momentum range of up to 1.times.10.sup.+9 g cm/s.sup.2.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: January 20, 1998
    Assignee: Eastman Kodak Company
    Inventors: Rajesh Vinodrai Mehta, Donald Robert Irwin, Douglas E. Singer