Patents by Inventor Charles Hubert LeBlanc, Jr.

Charles Hubert LeBlanc, Jr. 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).

  • Stabilized phenylenediamine color developer compositions
    Patent number: 6130029
    Abstract: Disclosed is a method for the stabilization of dry N,N-dialkyl-p-phenylenediamine color developers and to the stabilized compositions thus obtained wherein the color developer which is susceptible to oxidative discoloration is intimately mixed with a stabilizing amount of an alkali metal metabisulfite, bisulfite or sulfite The method is particularly useful for the stabilization of salts of N-ethyl-N-(2-hydroxyethyl)4-amino-3-methylaniline.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: October 10, 2000
    Assignee: Eastman Chemical Company
    Inventor: Charles Hubert LeBlanc, Jr.