US3298928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolysis of cellulosic material in concurrent gaseous flow
Assignee: Weyerhaeuser Co
•
Filing: 1966-01-18
•
Granted: 1967-01-17
•
Expires: 1986-01-18
Abstract
No abstract record available.
Inventors
- 👤 Arnulf K Esterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:39
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/02; C10B49/00; C10B49/02; C10B49/04; C10B49/08; C10B49/10; Y; Y02; Y02E; Y02E50/00; Y02E50/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A PROCESS FOR THE PYROLYTIC DEGRADATION OF CELLULOSIC MATERIAL WHICH COMPRISES: (A) INTRODUCING SMALL PIECES OF CELLULOSIC MATERIAL AND A STREAM OF HEATED GAS SUBSTANTIALLY FREE OF OXIDIZING EFFECTS INTO A REACTION ZONE, (B) MOVING THE PIECES AND THE ENTRAINING HOT GASEOUS MEDIUM IN CONCURRENT FLOW THROUGH THE REACTION ZONE, (C) MAINTAINING THE PIECES IN THE REACTION ZONE AT A TEMPERATURE OF 600-1500*F. THEREBY FORMING A REACTION PRODUCT COMPRISING CHAR, CONDENSABLE GASES AND NON-CONDENSABLE GASES, (D) REMOVING THE REACTION PRODUCT FROM THE REACTION ZONE AFTER A RESIDENCE TIME NOT EXCEEDING 30 SECONDS, (E) RAPIDLY COOLING THE REACTION PRODUCT, (F) SEPARATING THE RESULTING CONDENSATE OF CONDENSED GASES AND CHAR FROM THE NON-CONDENSABLE GASES AND (G) SEPARATING FROM THE CONDENSATE THE SELECTED PYROLYTIC DEGRADATION PRODUCTS OF THE CELLULOSIC MATERIAL.
Claim 2
Dependent Claim
127 words
A PROCESS FOR THE PYROLYTIC DEGRADATION OF CELLULOSIC MATERIAL WHICH COMPRISES: (A) INTRODUCING SMALL PIECES OF CELLULOSIC MATERIAL AND A STREAM OF HEATED GAS SUBSTANTIALLY FREE OF OXIDIZING EFFECTS INTO A REACTION ZONE, (B) MOVING THE PIECES AND THE ENTRAINING HOT GASEOUS MEDIUM IN CONCURRENT FLOW THROUGH THE REACTION ZONE, (C) MAINTAINING THE PIECES IN THE REACTION ZONE AT A TEMPERATURE OF 600-1500*F. THEREBY FORMING A REACTION PRODUCT COMPRISING CHAR, CONDENSABLE GASES AND NON-CONDENSABLE GASES, (D) REMOVING THE REACTION PRODUCT FROM THE REACTION ZONE AFTER A RESIDENCE TIME NOT EXCEEDING 30 SECONDS, (E) RAPIDLY COOLING THE REACTION PRODUCT, (F) SEPARATING THE RESULTING CONDENSATE OF CONDENSED GASES AND CHAR FROM THE NON-CONDENSABLE GASES AND (G) SEPARATING FROM THE CONDENSATE THE SELECTED PYROLYTIC DEGRADATION PRODUCTS OF THE CELLULOSIC MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |