Patent US2666770A successfully refreshed from Google Patents.
US2666770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline cleavage of pseudosapogenin oxidation products
Assignee: Individual
•
Filing: 1953-02-20
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Granted: 1954-01-19
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Expires: 1973-02-20
Abstract
No abstract record available.
Inventors
- 👤 Monroe E Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:24
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
IN A PROCESS FOR MAKING A $16-PREGNENOLONE FROM A STEROIDAL SAPOGENIN, THE STEPS COMPRISING CLEAVING AN OXIDIZED PSEUDOSAPOGENIN BY THE ACTION OF ALKALI IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC TERTIARY ALCOHOLS HAVING NOT MORE THAN SIX CARBON ATOMS, PYRIDINE AND LOWER ALKYLYPYRIDINES.
Claim 2
Dependent Claim
46 words
IN A PROCESS FOR MAKING A $16-PREGNENOLONE FROM A STEROIDAL SAPOGENIN, THE STEPS COMPRISING CLEAVING AN OXIDIZED PSEUDOSAPOGENIN BY THE ACTION OF ALKALI IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC TERTIARY ALCOHOLS HAVING NOT MORE THAN SIX CARBON ATOMS, PYRIDINE AND LOWER ALKYLYPYRIDINES.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |