US3054810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 21-monoesters of steroids of the pregnane series
Assignee: Wyeth Holdings LLC
•
Filing: 1960-08-15
•
Granted: 1962-09-18
•
Expires: 1980-08-15
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Leeson
- 👤 James A Lowery
- 👤 Krieger Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:22
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A PROCESS OF PREPARING COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
8 words
A PROCESS OF PREPARING COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |