US2622081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic ketal derivatives of steroids and method of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1951-12-04
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Granted: 1952-12-16
•
Expires: 1971-12-04
Abstract
No abstract record available.
Inventors
- 👤 Bernstein Seymour
- 👤 Antonucci Rose Mary
- 👤 Milton D Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:03
CPC Classifications
C; C07; C07J; C07J21/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A COMPOUND HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
6 words
A COMPOUND HAVING THE FOLLOWING FORMULA:
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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |