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US3654312A
Expired / Lapsed
US
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Novel 6-oxo-7 8 9 10-tetrahydro-6h-dibenzo(b d)pyrans
Assignee: Arthur D Little Inc
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Filing: 1970-05-21
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Granted: 1972-04-04
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Expires: 1990-05-21
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. AND CARDIOVASCULAR ACTIVITY AND 6OXO-7,8,9,10-TETRAHYDRO-6H-DIBENZO(B,D)PYRANS USED AS INTERMEDIATES IN THE PREPARATION THEREOF.
Inventors
- 👤 Harry G Pars
- 👤 Felix E Granchelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |