US3235541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of levoglucosan
Assignee: Fort James Corp
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Filing: 1963-07-26
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Granted: 1966-02-15
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Expires: 1983-07-26
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A PROCESS FOR PRODUCING LEVOGLUCOSAN WHICH COMPRISES THE STEPS OF (A) CONTACTING IN A REACTION ZONE A GLUCLOSE-YIELDING CARBOHYDRATE WITH A STREAM OF SUPERHEATED STEAM AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND A TEMPERATURE OF BETWEEN ABOUT 250*C. AND ABOUT 1000*C. FOR A TIME SUFFICIENT TO PRODUCE DECOMPOSITION PRODUCTS CONTAINING A SUBSTANTIAL AMOUNT OF LEVOGLUCOSAN PRODUCT, (B) REMOVING FROM THE REACTION ZONE SAID DECOMPOSITION PRODUCTS BY SAID STREAM OF SUPERHEATED STEAM, (C) SEPARATING THE LEVOGLUCOSAN PRODUCT FROM THE DECOMPOSITION PRODUCTS.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |