US2711359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching plant and method of bleaching cellulose pulp
Assignee: Metso Fiber Karlstad AB
•
Filing: 1953-10-19
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Granted: 1955-06-21
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Expires: 1973-10-19
Abstract
No abstract record available.
Inventors
- 👤 Johansen Rolf Jomar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:51
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A PROCESS FOR BLEACHING CELLULOSIC PULP CONTAINING AT LEAST ONE BLEACHING OPERATION CONDUCTED IN A REACTION TOWER WHEREIN THE BLEACHED PULP IS DISCHARGED AT THE TOP OF THE TOWER AND THEREAFTER WASHED IN A FILTER, THE IMPROVEMENT WHICH COMPRISES DIILUTING THE BLEACHED PULP AT THE TOP OF THE TOWER WITH A WASH LIQUOR, DROPPING THE DILUTED BLEACHED PULP INTO A SUBSTANTIALLY VERTICAL DROP TUBE THE TOP OF WHICH HAS ACCESS TO THE ATMOSPHERE, DISCHARGING SAID DILUTE BLEACHED PULP TOGETHER WITH THE AIR UNDER PRESSURE ENTRAINED THEREIN FROM THE LOWER END OF SAID DROP TUBE INTO A DEVICE FOR SEPARATING LIQUID AND AIR, FEEDING SAID DILUTE BLEACHED PULP AND SAID AIR UNDER PRESSURE INTO A PRESSURE FILTER AND REMOVING SAID PULP FROM THE AIR AND LIQUID PRESENT IN SAID FILTER.
Claim 2
Dependent Claim
130 words
IN A PROCESS FOR BLEACHING CELLULOSIC PULP CONTAINING AT LEAST ONE BLEACHING OPERATION CONDUCTED IN A REACTION TOWER WHEREIN THE BLEACHED PULP IS DISCHARGED AT THE TOP OF THE TOWER AND THEREAFTER WASHED IN A FILTER, THE IMPROVEMENT WHICH COMPRISES DIILUTING THE BLEACHED PULP AT THE TOP OF THE TOWER WITH A WASH LIQUOR, DROPPING THE DILUTED BLEACHED PULP INTO A SUBSTANTIALLY VERTICAL DROP TUBE THE TOP OF WHICH HAS ACCESS TO THE ATMOSPHERE, DISCHARGING SAID DILUTE BLEACHED PULP TOGETHER WITH THE AIR UNDER PRESSURE ENTRAINED THEREIN FROM THE LOWER END OF SAID DROP TUBE INTO A DEVICE FOR SEPARATING LIQUID AND AIR, FEEDING SAID DILUTE BLEACHED PULP AND SAID AIR UNDER PRESSURE INTO A PRESSURE FILTER AND REMOVING SAID PULP FROM THE AIR AND LIQUID PRESENT IN SAID FILTER.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |