| 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 |