US2552896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methanol extraction of cascara sagrada bark
Assignee: F Hoffmann La Roche AG
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Filing: 1948-09-18
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Granted: 1951-05-15
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Expires: 1968-09-18
Abstract
No abstract record available.
Inventors
- 👤 Lee John
- 👤 Fells Essex
- 👤 Berger Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:07
CPC Classifications
A; A61; A61K; A61K36/00; A61K36/18; A61K36/185; A61K36/72; C; C07; C07H; C07H15/00; C07H15/20; C07H15/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
A MEHTOD OF PREPARING CASANTHRANOL WHICH COMPRISES EXTRACTING CASCARA SAGRADA BARK WITH METHANOL, THE ENTIRE PROCESS TAKING PLACE IN THE ABSENCE OF WATER.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |