Issued Patents 1989
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886890 | Diquarternary nitrogen compounds | Ratan K. Chaudhuri, David J. Tracy | 1989-12-12 |
| 4885158 | Heat stable quaternized lactams having oxylated sulfur anions | David J. Tracy, Thomas Rizzo | 1989-12-05 |
| 4883655 | Quaternized nitrogen containing polycyclic compounds | Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff | 1989-11-28 |
| 4871535 | Compositions used in permanent structure altering of hair | Michael W. Helioff, Carmen D. Bires | 1989-10-03 |
| 4842858 | Polymeric halophors | David J. Tracy, Mohamed M. Hashem | 1989-06-27 |
| 4837013 | Quaternized nitrogen containing compounds | Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff | 1989-06-06 |
| 4834970 | Cosometic compositions containing quaternized nitrogen containing compound | Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff | 1989-05-30 |
| 4834767 | Compositions used in permanent alteration of hair color | Michael W. Helioff, Carmen D. Bires | 1989-05-30 |
| 4830851 | Polymeric halophors | David J. Tracy, Mohamed M. Hashem | 1989-05-16 |
| 4830850 | Quaternized nitrogen containing compounds | Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff | 1989-05-16 |
| 4812263 | Bis-quaternary ammonium compounds | — | 1989-03-14 |
| 4808569 | Fragrance additive | Ratan K. Chaudhuri, Michael W. Helioff | 1989-02-28 |
| 4801400 | Epoxy pyrrolidone based non-ionic surfactants | Mohamed M. Hashem, David J. Tracy | 1989-01-31 |