US3429889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
8 - alkyl - (and 8 - cycloalkyl - lower-alkyl - )10 - hydroxy - 5 - oxo - 1,2,3,4-tetrahydro - 5h(1)benzo - pyrano(3,4 - d) pyridines
Assignee: Dow Chemical Co
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Filing: 1965-09-27
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Granted: 1969-02-25
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Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 Alexander T Shulgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:52
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/547; C07F9/6561
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |