Patents by Inventor Madeline Leduc

Madeline Leduc 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).

  • Tri-aromatic azomethine direct dyes comprising at least one unit derived from resorcinol, dyeing composition, method and use
    Patent number: 9439844
    Abstract: The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I): and their use for coloring keratin fibers, particularly human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibers using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: September 13, 2016
    Assignee: L'OREAL
    Inventors: Stephane Sabelle, Madeline Leduc
  • TRI-AROMATIC AZOMETHINE DIRECT DYES COMPRISING AT LEAST ONE UNIT DERIVED FROM RESORCINOL, DYEING COMPOSITION, METHOD AND USE
    Publication number: 20150027483
    Abstract: The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I): and their use for colouring keratin fibres, particularly human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibres using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.
    Type: Application
    Filed: December 13, 2012
    Publication date: January 29, 2015
    Applicant: L'OREAL
    Inventors: Stephane Sabelle, Madeline Leduc