Patents by Inventor Francois Pierron

Francois Pierron 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 the production of light-colored pastes of .alpha.-sulfofatty acid alkyl ester alkali metal salts
    Patent number: 5391783
    Abstract: In the production of light-colored pastes of .alpha.-sulfofatty acid alkyl ester alkali metal salts by reaction of fatty acid alkyl esters with gaseous SO.sub.3, subsequent after-reaction in liquid phase, neutralization with aqueous alkali metal hydroxide solutions and bleaching, effective bleaching can be obtained without any reduction in the washing-active substance content by addition of the hydrogen peroxide during neutralization of the .alpha.-sulfofatty acid alkyl ester and subjecting the neutralization product obtained to a temperature-controlled after-reaction.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: February 21, 1995
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Dietmar Colignon, Erich Dorra, Herbert Lepper, Guenter Panthel, Francois Pierron, Wolfgang Schmidt, Norbert Wrede