US2773079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopentanophenanthrene derivatives and method for preparation thereof
Assignee: Syntex SA
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Filing: 1952-09-03
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Granted: 1956-12-04
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Expires: 1972-09-03
Abstract
No abstract record available.
Inventors
- 👤 Djerassi Carl
- 👤 Rosenkranz George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:06
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
15 words
A NEW COMPOUND CONSISTING OF ALLOPREGNANE-3B, 11A, 17A-TRIOL-20-ONE HAVING A MELTING POINT OF 253*-255* C.
References Cited (Backward Citations)
FR868336A
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US2352852A
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GB561561A
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US2541104A
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US2596563A
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US2632008A
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US2602804A
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US2647134A
Cited
US2602769A
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US2713588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |