US3790637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of vanillin from sulfite waste liquor
Assignee: Wyeth Holdings LLC
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Filing: 1972-05-04
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Granted: 1974-02-05
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Expires: 1992-05-04
Abstract
Abstract VANILLIN IS MADE BY OXYGENATING SULFITE WASTE LIQUOR AT A SUBSTANTIALLY NEUTRAL PH (I.E., BETWEEN PH 5.5 AND 8) IN THE PRESENCE OF A WATER-INSOLUBLE SOLVENT FOR VANILLIN TO EFFECT REMOVAL THEREOF.
Inventors
- 👤 C Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:47
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/78; D; D21; D21C; D21C11/00; D21C11/0007
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |