Issued Patents All Time
Showing 25 most recent of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5989299 | Mixtures of amine modified lignin with sulfonated lignin for disperse dye | Gamini S. Samaranayake | 1999-11-23 |
| 5980589 | High activity sulfonated lignin dye dispersants | Sallie B. Huguenin | 1999-11-09 |
| 5972047 | Amine modified sulfonated lignin for disperse dye | Gamini S. Samaranayake, Staci L. Waldrop | 1999-10-26 |
| 5755830 | Method of preparing high activity sulfonated lignin dye dispersants | Sallie B. Huguenin | 1998-05-26 |
| 5749926 | Method of preparing high activity sulfonated lignin dye dispersants | Sallie B. Huguenin | 1998-05-12 |
| 5049661 | Sulfonation of lignins | — | 1991-09-17 |
| 5043433 | Oleum sulfonation of lignins | — | 1991-08-27 |
| 5043432 | Sulfonation of lignins | — | 1991-08-27 |
| 5043434 | Oleum sulfonation of lignins | — | 1991-08-27 |
| 5013825 | Sulfation of lignin | — | 1991-05-07 |
| 4892587 | Lignosulfonate additive-containing carbon black compositions | Gerald Prazak, Catherine C. Cashman | 1990-01-09 |
| 4892588 | Production of lignosulfonate additives | Vaughn R. Loeffler, Gerald Prazak, Karin U. Thomas | 1990-01-09 |
| 4891070 | Lignin amine salt as binder for aqueous printing ink composition | Mitchell S. Dimitri | 1990-01-02 |
| 4797157 | Amine salts of lignosulfonates | Humbert Thomas Dellicolli, James E. Davis | 1989-01-10 |
| 4764597 | Method for methylolation of lignin materials | — | 1988-08-16 |
| 4751247 | Amine salts of lignosulfonates | Humbert Thomas Dellicolli, James E. Davis | 1988-06-14 |
| 4748235 | Method of producing improved amine salts of lignosulfonates | Susan L. Schlegel | 1988-05-31 |
| 4743268 | Dispersant composition for azo dyestuffs contaminated with soluble copper impurities | — | 1988-05-10 |
| 4740590 | Method for preparing low electrolyte sodium lignosulfonates | — | 1988-04-26 |
| 4740591 | Lignin by-products of paper-making process | Mitchell S. Dimitri | 1988-04-26 |
| 4732572 | Amine salts of sulfomethylated lignin | — | 1988-03-22 |
| 4721778 | Ammonium lignosulfonates | — | 1988-01-26 |
| 4715864 | Lignosulfonate salts for use as dyestuff additives | Susan L. Schlegel | 1987-12-29 |
| 4670482 | Ammonium lignosulfonates | — | 1987-06-02 |
| 4642336 | Ammonium lignosulfonates | — | 1987-02-10 |