US3676462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7,8,9,10-TETRAHYDRO (AND 7,8,9,10,11,12-HEXAHYDRO) 6H-DIBENZO {8 b,d{9 {0 PYRANS
Assignee: Arthur D Little Inc
•
Filing: 1970-01-08
•
Granted: 1972-07-11
•
Expires: 1990-01-08
Abstract
Abstract A series of novel 7,8,9,10-tetrahydro-6H-dibenzo (b, d) pyrans and 7,8,9,10,11,12-hexahydro-6H-dibenzo (b,d) pyrans having C.N.S. activity.
Inventors
- 👤 Harry G Pars
- 👤 Felix E Granchelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/08; C07D295/096; C07D311/00; C07D311/02; C07D311/78; C07D311/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A compound according to claim 1 where R2 is lower-alkyl and R3 is hydrogen.
Claim 2
Dependent Claim
23 words
3-(2-Dimethylaminoethyl)-1-hydroxy-6,6,9-trimethyl-7,8,9,10-tetrahydro-6H -dibenzo(b,d)pyran according to claim 2 where R2 as lower-alkyl is 9-methyl; Alk as lower-alkylene is 1,2-ethylene; and N=B as di-lower-alkylamino is dimethylamino.
References Cited (Backward Citations)
US3325489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |