US3784408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing xylose
Assignee: F Hoffmann La Roche AG
•
Filing: 1970-09-16
•
Granted: 1974-01-08
•
Expires: 1990-09-16
Abstract
Abstract Material containing cellulose, lignins and xylan is hydrolyzed and the resulting aqueous solution is extracted with methanol to obtain crystalline xylose. The xylose may be hydrogenated to produce xylitol.
Inventors
- 👤 G Jaffe
- 👤 W Szkrybalo
- 👤 P Weinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
C; C13; C13K; C13K13/00; C13K13/002; C07; C07C; C07C31/00; C07C31/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
The process of claim 1 wherein said material is aqueous cellulosic extracts.
Claim 2
Dependent Claim
13 words
The process of claim 1 wherein said material is dried ground oat hulls.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the methanol in step (e) is added in an amount of at least 0.5 ml. per gram of the dried effluent.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said extracts are aqueous extraction products of hard wood.
References Cited (Backward Citations)
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US2944922A
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US2974067A
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US3212932A
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US3479248A
Cited
US3558725A
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US3579380A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |