US2353808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounds of the cyclopentano-polyhydrophenanthrene series and a process for the manufacture of the same
Assignee: Merck Sharp & Dohme LLC
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Filing: 1939-06-30
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Granted: 1944-07-18
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Expires: 1959-06-30
Abstract
No abstract record available.
Inventors
- 👤 Butenandt Adolf
- 👤 Schmidt-Thome Josef
- 👤 Schwenk Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 0
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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) | 1947-07-18 | 1948-01-17 | 1948-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-18 | 1952-01-17 | 1952-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-18 | 1956-01-17 | 1956-07-18 | $7700.00 | Window Closed / Lapsed |