Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4384094 | 3-Substituted- 7-dialkylamino-spiro(2H-1-benzopyran-2,3'-(3H)-naphtha(2,1-b)pyrans) | John E. Herweh, Thomas B. Garrett | 1983-05-17 |
| 4382134 | 3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho(2,1-B)pyrans) | John E. Herweh, Thomas B. Garrett | 1983-05-03 |
| 4348508 | 3-Substituted-7-alkoxy-2,2'-Spirobi[2H-1-benzopyrans] | John E. Herweh, Thomas B. Garrett | 1982-09-07 |
| 4346186 | Process for fixing photo-induced colored derivatives of spiropyrans and compositions therefor | Thomas B. Garrett, John E. Herweh, Normal L. Miller | 1982-08-24 |
| 4342696 | 7-Dimethylamino-3-substituted-2,2'-spirobi[2H-1-benzopyrans] | Thomas B. Garrett, John E. Herweh | 1982-08-03 |