Patent US3553236A successfully refreshed from Google Patents.
US3553236A
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Psoralene and isopsoralene, process for their isolation and separation
Assignee: FRANCO INDIAN PHARMACEUTICALS
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Filing: 1968-12-06
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Granted: 1971-01-05
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Expires: 1988-12-06
Abstract
Abstract PSORALEA CORYLIFOLIA SEEDS ARE CRUSHED, THE ESSENTIAL OIL CONTAINING THE ACTIVE PRINCIPLE IS EXTRACTED BY AN ORGANIC SOLVENT SUCH AS BENZENE AND PSORALENE IS PRECIPITATED BY ADDING A HYDROCARBON TO THE EXTRACT AND ISOPSORALENE IS CRYSTALLIZED FROM MOTHER LIQUOR.
Inventors
- 👤 Antoine Hascher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:56
CPC Classifications
A; A61; A61K; A61K36/00; A61K36/18; A61K36/185; A61K36/48; A61K36/487
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |