Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5489313 | Method for salt-free dyeing | David M. Hall, Tony M. Leonard, Charles D. Cofield | 1996-02-06 |
| 5330541 | Method for salt-free dyeing | David M. Hall, Tony M. Leonard, Charles D. Cofield | 1994-07-19 |