Patent US3388960A successfully refreshed from Google Patents.
Patent US2037823A successfully refreshed from Google Patents.
Patent US3294623A successfully refreshed from Google Patents.
US3294623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous digestion and purification with recirculation of liquor
Assignee: International Paper Co
•
Filing: 1966-02-23
•
Granted: 1966-12-27
•
Expires: 1986-02-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Amiel W Brinkley
- 👤 Guthrie S Mabrey
- 👤 John W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:19
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/08; C; C08; C08B; C08B1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS OF CELLULOSIC PULP MANUFACTURER, PURIFICATION, AND PREPARATION FOR BLEACHING IN WHICH CELLULOSIC FIBROUS MATERIAL IS CONTINUOUSLY COOKED WITH AN ALKALINE LIQUOR TO PRODUCE CELLULOSIC PULP AND SPENT COOKING LIQUOR SUITABLE FOR RECOVERY AND IN WHICH ALL OF THE ALKALINE LIQUOR IS BROUGHT TOGETHER WITH THE CELLULOSIC FIBROUS MATERIAL AFTER HAVING FIRST BEEN DISPLACED BY WATER FROM PREVIOUSLY PRODUCED CELLULOSIC PULP READY TO BE BLEACHED, HAVING SECOND BEEN USED TO STEEP PREVIOUSLY PRODUCED CELLULOSIC PULP PRIOR TO ITS BEING MADE MADE READY FOR BLEACHING BY RESORT TO SUCH A WATER DISPLACEMENT, AND HAVING THIRD BEEN USED TO DISPLACE FOR RECOVERY PREVIOUSLY PRODUCED SPENT COOKING LIQUOR FROM PREVIOUSLY PRODUCED CELLULOSIC PULP.
Claim 2
Dependent Claim
111 words
A PROCESS OF CELLULOSIC PULP MANUFACTURER, PURIFICATION, AND PREPARATION FOR BLEACHING IN WHICH CELLULOSIC FIBROUS MATERIAL IS CONTINUOUSLY COOKED WITH AN ALKALINE LIQUOR TO PRODUCE CELLULOSIC PULP AND SPENT COOKING LIQUOR SUITABLE FOR RECOVERY AND IN WHICH ALL OF THE ALKALINE LIQUOR IS BROUGHT TOGETHER WITH THE CELLULOSIC FIBROUS MATERIAL AFTER HAVING FIRST BEEN DISPLACED BY WATER FROM PREVIOUSLY PRODUCED CELLULOSIC PULP READY TO BE BLEACHED, HAVING SECOND BEEN USED TO STEEP PREVIOUSLY PRODUCED CELLULOSIC PULP PRIOR TO ITS BEING MADE MADE READY FOR BLEACHING BY RESORT TO SUCH A WATER DISPLACEMENT, AND HAVING THIRD BEEN USED TO DISPLACE FOR RECOVERY PREVIOUSLY PRODUCED SPENT COOKING LIQUOR FROM PREVIOUSLY PRODUCED CELLULOSIC PULP.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |