Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867751 | Use of benzoquinones for the direct dyeing of keratin fibres | Gerard Lang, Jean F. Grollier, Georges Rosenbaum | 1989-09-19 |
| 4814162 | Cosmetic compositions containing hydroxyl derivatives of dibenzoylmethane and their use in protecting the skin against ultraviolet rays and derivatives for use therein | Gerald S. Lang, Madeleine Leduc | 1989-03-21 |