US3309355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levoglucosan production by pyrolysis of cellulosic material
Assignee: Weyerhaeuser Co
•
Filing: 1963-11-22
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Granted: 1967-03-14
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Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
- 👤 Arnulf K Esterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
C; C08; C08H; C08H8/00; C07; C07H; C07H19/00; C07H19/01; C08B; C08B1/00; C10; C10C; C10C5/00; Y; Y02; Y02E; Y02E50/00; Y02E50/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE PROCESS OF PRODUCING A PRODUCT RICH IN LEVOGLUCOSAN WHICH COMPRISES (A) INTRODUCING INTO A REACTION ZONE SMALL PIECES OF CELLULOSIC MATERIAL AND EITHER SUPERHEATED STEAM, NITROGEN, CARBON DIOXIDE, OR A NONCONDENSIBLE GAS PRODUCT OF THE REACTION, (B) HEATING THE SUSPENDED PIECES TO A TEMPERATURE OF FROM 600-1500*F., THEREBY FORMING A PYROLYZED PRODUCT COMPRISING CHAR, CONDENSIBLE GASES AND NONCONDENSIBLE GASES, (C) RAPIDLY COOLING THE PYROLYZED PRODUCT AFTER EXPOSURE OF THE GASEOUS COMPONENTS TO A HEATING PERIOD NOT EXCEEDING 30 SECONDS, (D) CONDENSING THE CONDENSIBLE GASES, (E) SEPARATING THE NON-CONDENSIBLE GASES FROM THE CONDENSED GASES AND CHAR, THEREBY FORMING A PRODUCT COMPRISING AQUEOUS AND NON-AQUEOUS PHASES, (F) AND SEPARATING FROM THE NON-AQUEOUS PHASE AN AQUEOUS PHASE RICH IN LEVOGLUCOSAN.
Claim 2
Dependent Claim
118 words
THE PROCESS OF PRODUCING A PRODUCT RICH IN LEVOGLUCOSAN WHICH COMPRISES (A) INTRODUCING INTO A REACTION ZONE SMALL PIECES OF CELLULOSIC MATERIAL AND EITHER SUPERHEATED STEAM, NITROGEN, CARBON DIOXIDE, OR A NONCONDENSIBLE GAS PRODUCT OF THE REACTION, (B) HEATING THE SUSPENDED PIECES TO A TEMPERATURE OF FROM 600-1500*F., THEREBY FORMING A PYROLYZED PRODUCT COMPRISING CHAR, CONDENSIBLE GASES AND NONCONDENSIBLE GASES, (C) RAPIDLY COOLING THE PYROLYZED PRODUCT AFTER EXPOSURE OF THE GASEOUS COMPONENTS TO A HEATING PERIOD NOT EXCEEDING 30 SECONDS, (D) CONDENSING THE CONDENSIBLE GASES, (E) SEPARATING THE NON-CONDENSIBLE GASES FROM THE CONDENSED GASES AND CHAR, THEREBY FORMING A PRODUCT COMPRISING AQUEOUS AND NON-AQUEOUS PHASES, (F) AND SEPARATING FROM THE NON-AQUEOUS PHASE AN AQUEOUS PHASE RICH IN LEVOGLUCOSAN.
References Cited (Backward Citations)
US3235541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |