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US2489200A
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Separation of vanillin from alkaline solutions
Assignee: Ontario Paper Co Ltd
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Filing: 1946-09-28
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Granted: 1949-11-22
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Expires: 1966-09-28
Abstract
No abstract record available.
Inventors
- 👤 Charles A Sankey
- 👤 Marshall Harry Borden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:03
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/80; A; A23; A23L; A23L27/00; A23L27/10; A23L27/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414385A
Cited
US2399607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |