US2632008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for converting sapogenins into pseudosapogenins
Assignee: Merck Sharp & Dohme LLC
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Filing: 1950-12-26
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Granted: 1953-03-17
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Expires: 1970-12-26
Abstract
No abstract record available.
Inventors
- 👤 David H Gould
- 👤 Emanuel B Hershberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:18
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
PROCESS FOR THE CONVERSION OF SAPOGENIN FORMS, WHICH POUNDS INTO THE PSEUDO-SAPOGENIN FORMS, WHICH COMPRISES HEATING A MEMBER OF THE CLASS CONSISTING OF SAPOGENINS AND THEIR CORRESPONDING KETONES, ESTERS, ETHERS AND DESOXY COMPOUNDS, WITH AN ORGANIC ACID ANHYDRIDE UNDER ATMOSPHERIC PRESSURE AND IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE ABOVE ROOM TEMPERATURE BUT BELOW 175* C. UNTIL THE 26-ACYLOXY DERIVATIVE OF THE PSEUDO FROM THE SAPOGENIN IS OBTAINED.
Claim 2
Dependent Claim
71 words
PROCESS FOR THE CONVERSION OF SAPOGENIN FORMS, WHICH POUNDS INTO THE PSEUDO-SAPOGENIN FORMS, WHICH COMPRISES HEATING A MEMBER OF THE CLASS CONSISTING OF SAPOGENINS AND THEIR CORRESPONDING KETONES, ESTERS, ETHERS AND DESOXY COMPOUNDS, WITH AN ORGANIC ACID ANHYDRIDE UNDER ATMOSPHERIC PRESSURE AND IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE ABOVE ROOM TEMPERATURE BUT BELOW 175* C. UNTIL THE 26-ACYLOXY DERIVATIVE OF THE PSEUDO FROM THE SAPOGENIN IS OBTAINED.
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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |