US3558725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of xylitol
Assignee: Eisai Co Ltd
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Filing: 1968-02-27
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Granted: 1971-01-26
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Expires: 1988-02-27
Abstract
Abstract NOVEL PROCESS FOR THE PREPARATION OF XYLITOL BY CATALYTIC HYDROGENATION OF A XYLOSE-CONTAINING SOLUTION WHICH HAS BEEN OBTAINED BY HYDROLYZING DEGRADATION OF COTTON SEED HULLS OR HUSKS, THE PROCESS BEING CHARACTERIZED BY THE FACT THAT SAID XYLOSE-CONTAINING SOLUTION IS DIRECTLY SUBJECTED TO THE CATALYTIC HYDROGENATION AFTER PURIFICATION THROUGH CONSECUTIVE TREATMENTS OF THE CRUDE SOLUTION FIRST WITH AN ACIDIC CATION EXCHANGE RESIN AND THEN WITH A MEDIUM BASIC ANION EXCHANGE RESIN.
Inventors
- 👤 Shigeharu Kohno
- 👤 Isao Yamatsu
- 👤 Seigo Ueyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:58
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |