Patents by Inventor Majdi M. Shahin

Majdi M. Shahin 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).

  • Meta-phenylenediamines, dyeing compositions in which they are present and the corresponding dyeing process
    Patent number: 4333730
    Abstract: Novel meta-phenylenediamines are provided for use as couplers with dye bases in hair dye compositions. These meta-phenylenediamines have the formula: ##STR1## in which n is 2, 3 or 4. Their acid addition salts may also be used.
    Type: Grant
    Filed: April 18, 1980
    Date of Patent: June 8, 1982
    Assignee: Societe Anonyme dite: L'Oreal
    Inventors: Andree Bugaut, Majdi M. Shahin, Jean-Jacques H. Vandenbossche, Gregoire Kalopissis
  • Dyeing compositions for keratin fibres containing meta-phenylenediamines
    Patent number: 4330292
    Abstract: The invention resides in the use of the compounds having the formula given below, or an acid salt thereof, as couplers in dyeing compositions for keratin fibres which contain an oxidation base: ##STR1## in which formula n is equal to 2, 3 or 4 and R.sub.1 and R.sub.2 are identical or different and represent an alkyl group having from 1 to 4 carbon atoms.
    Type: Grant
    Filed: December 11, 1980
    Date of Patent: May 18, 1982
    Assignee: L'Oreal
    Inventors: Andree Bugaut, Jean-Jacques M. Vandenbossche, Majdi M. Shahin, Gregoire Kalopissis