US1951807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-phenalkyl-3-keto-3.4-dihydro-1.4-benzoxazines and process for the manufacture of same
Assignee: Hoffmann La Roche Inc
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Filing: 1932-01-07
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Granted: 1934-03-20
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Expires: 1952-01-07
Abstract
No abstract record available.
Inventors
- 👤 Preiswerk Ernst
- 👤 Mayer Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:14
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/28; C07D265/34; C07D265/36
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) | 1937-03-19 | 1937-09-18 | 1938-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-03-19 | 1941-09-18 | 1942-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-03-19 | 1945-09-18 | 1946-03-20 | $7700.00 | Window Closed / Lapsed |