US2999785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and plant for washing of cellulosic pulp under overpressure
Assignee: Metso Fiber Karlstad AB
•
Filing: 1959-07-17
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Granted: 1961-09-12
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Expires: 1979-07-17
Abstract
No abstract record available.
Inventors
- 👤 Richter Johan Christoffer Carl
- 👤 Johansen Rolf Jomar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/02; D21C9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
A METHOD OF WASHING DIGESTING LIQUOR FROM CELLULOSIC PULP SUPPLIED FROM A BLOW TANK TO FILTER HAVING A ROTARY SIEVE DRUM, BY MEANS OF STEAM LIBERATED FROM SAID PULP BY DROPPING THE PRESSURE THEREON AT THE INTRODUCTION OF THE PULP INTO SAID BLOW TANK, WHICH METHOD COMPRISES CARRYING THE PULP WHILE STILL UNDER SUPERATMOSPHERIC PRESSURE FROM THE BLOW TANK TO THE PULP VAT OF THE FILTER, FORMING A LAYER OF PULP ON AT LEAST THE UPPER EXTERIOR SURFACE OF SAID SIEVE DRUM; SEPARATELY INTRODUCING SAID STEAM FROM SAID BLOW TANK INTO A CASING ENCLOSING SAID SIEVE DRUM, AND ABOVE THE LIQUID LEVEL OF SAID PULP VAT THEREIN; THEREBY MAINTAINING THE PART OF THE EXTERIOR OF SAID SIEVE DRUM LOCATED ABOVE THE PULP
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US1762560A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |