Patent US601904A successfully refreshed from Google Patents.
Patent US2895993A successfully refreshed from Google Patents.
US2895993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl substituted anhydrotetracycline compounds and process of preparing the same
Assignee: Pfizer Inc
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Filing: 1957-05-16
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Granted: 1959-07-21
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Expires: 1977-05-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles R Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:45
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE D-RING NUCLEARLY SUBSTITUTED COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 5A,6-ANHYDROTETRACYCLINE, 5A,6-ANHYDROCHLORTERACYCLINE, AND 5A,6-ANHYDROBROMTETRACYCLINE, WHEREIN SAID D-RING NUCLEAR SUBSTITUENT IS A HYDROCARBON CONTAINING UP TO 9 CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF
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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |