Patents by Inventor Marie Francoise Bosq

Marie Francoise Bosq 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 preserving the dyeing capacity of 5, 6-dihydroxyindole and of its and derivatives in an aqueous medium, composition and dyeing process
    Patent number: 6258131
    Abstract: Process for preserving the dyeing capacity of 5,6-dihydroxyindole or of of its derivatives corresponding to the formula (I); in which R1, R2, R3 and R4, which are identical or different donates hydrogen or a C1-C4 lower alkyl, R1, R2 and R3 denoting hydrogen when R4 denotes alkyl in an aqueous medium, characterized in that the pH of the aqueous medium is adjusted to a value pHC of between 5 and 10 by employing a pH-regulating agent containing two components (A) and (B), the component (A) being chosen from pH-regulating agents which have a dissociation constant KCA in aqueous solution at 25° C., such as pkCA, that is: 0<pkCA−pHC≦2.5 and the component (B) being chosen from pH-regulating agents which have a dissociation constant KCB in aqueous solution at 25° C., such as pkCB, that is: 2<pkCB<pHC.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: July 10, 2001
    Assignee: L'Oreal
    Inventors: Jean Francois Grollier, Marie Francoise Bosq, Jean Cotteret, Arnaud De Labbey