US2816119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steroid production
Assignee: Pharmacia and Upjohn Co
•
Filing: 1954-05-03
•
Granted: 1957-12-10
•
Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Campbell J Allan
- 👤 Douglas A Shepherd
- 👤 Arnold C Ott
- 👤 Byron A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:26
CPC Classifications
C; C07; C07J; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE PURIFICATION OF A STEROID WHICH COMPRISES THE STEPS OF (1) CONVERTING A STEROL MIXTURE CONSISTING ESSENTIALLY OF STIGMASTEROL AND AT LEAST ONE OF THE SITOSTEROLS INTO A MIXTURE ONE OF THEIR CORRESPONDING CARBAMATES, (2) FRACTIONATING THE MIXTURE INTO A DISSOLVED PORTION AND AN UNDISSOLVED PORTION BY CONTACTING THE MIXTURE WITH ORGANIC SOLVENT, (3) SEPARATING THE PORTION ENRICHED WITH THE DESIRED CARBAMATE FROM THE ORGANIC SOLVENT AND FROM THE PORTION ENRICHED WITH THE UNDESIRED CARBAMATE, (4) FRACTIONATING THE PORTION ENRICHED WITH THE DESIRED CARBAMATE INTO A DISSOLVED PORTION AND AN UNDISSOLVED PORTION BY CONTACTING THE ENRICHED PORTION WITH ORGANIC SOLVENT, AND (5) REPEATING STEPS 3 AND 4 AT LEAST ONCE.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE PURIFICATION OF A STEROID WHICH COMPRISES THE STEPS OF (1) CONVERTING A STEROL MIXTURE CONSISTING ESSENTIALLY OF STIGMASTEROL AND AT LEAST ONE OF THE SITOSTEROLS INTO A MIXTURE ONE OF THEIR CORRESPONDING CARBAMATES, (2) FRACTIONATING THE MIXTURE INTO A DISSOLVED PORTION AND AN UNDISSOLVED PORTION BY CONTACTING THE MIXTURE WITH ORGANIC SOLVENT, (3) SEPARATING THE PORTION ENRICHED WITH THE DESIRED CARBAMATE FROM THE ORGANIC SOLVENT AND FROM THE PORTION ENRICHED WITH THE UNDESIRED CARBAMATE, (4) FRACTIONATING THE PORTION ENRICHED WITH THE DESIRED CARBAMATE INTO A DISSOLVED PORTION AND AN UNDISSOLVED PORTION BY CONTACTING THE ENRICHED PORTION WITH ORGANIC SOLVENT, AND (5) REPEATING STEPS 3 AND 4 AT LEAST ONCE.
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) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |