US2919271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-amino-1, 2-dihydro-3h-pyrido [3, 2, 1-kl]-phenothiazines
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1957-12-05
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Granted: 1959-12-29
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Expires: 1977-12-05
Abstract
No abstract record available.
Inventors
- 👤 Paul N Craig
- 👤 John J Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
C; C07; C07D; C07D513/00; C07D513/02; C07D513/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
8 words
A CHEMICAL COMPOUND HAVING THE FUNDAMENTAL STRUCTUAL FORMULA:
References Cited (Backward Citations)
US2830050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |