Patent US2503385A successfully refreshed from Google Patents.
US2503385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 7-dehydrosterol esters
Assignee: Nopco Chemical Co
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Filing: 1948-04-14
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Granted: 1950-04-11
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Expires: 1968-04-14
Abstract
No abstract record available.
Inventors
- 👤 David H Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:41
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR IMPROVING THE PURITY, PHYSICAL APPEARANCE AND CRYSTALLINE NATURE OF AN ESTER OF A 7-DEHYDROSTEROL WHICH COMPRISES ADMIXING AN ESTER OF A 7-DEHYDROSTEROL WITH AT LEAST TWO VOLUMES OF A SATURATED ALIPHATIC HYDROCARBON SOLVENT CONTAINING FROM FOUR TO SEVEN CARBON ATOMS, SAID SOLVENT BEING AT A TEMPERATURE AT LEAST AS LOW AS ABOUT 0*C., AND THEN SEPARATING SAID SOLVENT FROM THE ESTER OF THE 7-DEHYDROSTEROL BY MEANS OTHER THAN EVAPORATION.
Claim 2
Dependent Claim
72 words
A PROCESS FOR IMPROVING THE PURITY, PHYSICAL APPEARANCE AND CRYSTALLINE NATURE OF AN ESTER OF A 7-DEHYDROSTEROL WHICH COMPRISES ADMIXING AN ESTER OF A 7-DEHYDROSTEROL WITH AT LEAST TWO VOLUMES OF A SATURATED ALIPHATIC HYDROCARBON SOLVENT CONTAINING FROM FOUR TO SEVEN CARBON ATOMS, SAID SOLVENT BEING AT A TEMPERATURE AT LEAST AS LOW AS ABOUT 0*C., AND THEN SEPARATING SAID SOLVENT FROM THE ESTER OF THE 7-DEHYDROSTEROL BY MEANS OTHER THAN EVAPORATION.
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) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |