Patents by Inventor Pierre H. Jezequel

Pierre H. Jezequel 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).

  • Method for obtaining monodisperse tabular grains
    Patent number: 5484697
    Abstract: The present invention relates to a method for preparing a photographic tabular silver halide grains emulsion. The method is characterized in that the twinned silver halide seeds are precipitated, either in an external static nucleator working in laminar flow regime with a Reynolds number less than 2100, or in a kettle with a very low stirring rate with respect to the one generally used, and in that the concentration of the Ag.sup.+ ion solution is ranging from 0.04 to 0.3M.Obtained are tabular silver halide grains, the diameter distribution of which is less than 15%.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: January 16, 1996
    Assignee: Eastman Kodak Company
    Inventors: Andre G. E. Mignot, Pierre H. Jezequel