Patent US3298900A successfully refreshed from Google Patents.
US3298900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the continuous bleaching of cellulosic pulp
Assignee: Metso Fiber Karlstad AB
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Filing: 1964-03-17
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Granted: 1967-01-17
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Expires: 1984-03-17
Abstract
No abstract record available.
Inventors
- 👤 Oliver A Laakso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:48
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A METHOD FOR CONTINUOUSLY BLEACHING CELLULOSIC PULP COMPRISING CONTINUOUSLY INTRODUCING CELLULOSIC PULP, BLEACH AND A RELATIVELY LARGE AMOUNT OF DILUTION LIQUID TO THE BOTTOM PORTION OF A VERTICALLY ELONGATED CONTAINER SO THAT SAID PULP IS OF LOWER CONSISTENCY IN SAID BOTTOM PORTION THAN PRIOR TO THE INTRODUCTION THERIN; AGITATING SAID PULP, BLEACH AND LIQUID TO FORM A RELATIVELY HOMOGENOUS MIXTURE THEREFROM; ROTATING A LIQUID COLLECTOR THROUGH SAID MIXTURE AT A POINT SPACED UPWARDLY FROM SAID BOTTOM PORTION; REMOVING A MAJOR PORTION OF SAID LIQUID AND SAID BLEACH FROM SAID MIXTURE THROUGH SAID LIQUID COLLECTOR , THE REMAINING BLEACH IN THE THICKENED MIXTURE BLEACHING THE PULP THEREIN AS THE MIXTURE MOVES UPWARDLY IN THE CONTAINER, WHEREIN THE PULP MOVING UPWARDLY IN THE CONTAINER, WHEREIN THE PULP MOVING UPWARDLY IN THE CONTAINER PAST SAID LIQUID COLLECTOR IS OF HIGHER CONSISTENCY THAN THE PULP IN SAID BOTTOM PORTION; AND REMOVING THE BLEACHED PULP FROM THE UPPER PORTION OF THE CONTAINER.
Claim 2
Independent Claim
157 words
A METHOD FOR CONTINUOUSLY BLEACHING CELLULOSIC PULP COMPRISING CONTINUOUSLY INTRODUCING CELLULOSIC PULP, BLEACH AND A RELATIVELY LARGE AMOUNT OF DILUTION LIQUID TO THE BOTTOM PORTION OF A VERTICALLY ELONGATED CONTAINER SO THAT SAID PULP IS OF LOWER CONSISTENCY IN SAID BOTTOM PORTION THAN PRIOR TO THE INTRODUCTION THERIN; AGITATING SAID PULP, BLEACH AND LIQUID TO FORM A RELATIVELY HOMOGENOUS MIXTURE THEREFROM; ROTATING A LIQUID COLLECTOR THROUGH SAID MIXTURE AT A POINT SPACED UPWARDLY FROM SAID BOTTOM PORTION; REMOVING A MAJOR PORTION OF SAID LIQUID AND SAID BLEACH FROM SAID MIXTURE THROUGH SAID LIQUID COLLECTOR , THE REMAINING BLEACH IN THE THICKENED MIXTURE BLEACHING THE PULP THEREIN AS THE MIXTURE MOVES UPWARDLY IN THE CONTAINER, WHEREIN THE PULP MOVING UPWARDLY IN THE CONTAINER, WHEREIN THE PULP MOVING UPWARDLY IN THE CONTAINER PAST SAID LIQUID COLLECTOR IS OF HIGHER CONSISTENCY THAN THE PULP IN SAID BOTTOM PORTION; AND REMOVING THE BLEACHED PULP FROM THE UPPER PORTION OF THE CONTAINER.
Claim 3
Dependent Claim
247 words
APPARATUS FOR BLEACHING CELLULOSIC PUPL AT A HIGH CONSISTENCY DURING CONTINUOUS VERTICALLY RISING MOVEMENT OF THE PULP, COMPRISING: AN UPRIGHT CYLCINDRICAL CONTAINER; A SCREEN BODY LOCATED IN SAID CONTAINER INTERMEDIATE THE UPPER AND LOWER ENDS THEREOF; SAID SCREEN BODY BEING ROTATABLE ABOUT THE LONGITUDINAL AXIS OF THE CONTAINER AND EXTENDING FROM THE VICINITY OF SAID LONGITUDINAL AXIS TO THE VICINITY OF THE CONTAINER SIDEWALL SO THA TSUBSTANTIALLY THE ENTIRE CROSS-SECTIONAL AREA OF THE CONTAINER IS SWEPT OVER BY SAID SCREEN BODY DURING ROTATION THEREOF, SAID CROSS-SECTIONAL AREA THEREBY DEFINING A FIRST CHAMBER IN SAID CONTAINER BELOW SAID SCREEN BODY AND A SECOND CHAMBER IN SAID CONTAINER ABOVE SAID SCREEN BODY; AND SCREEN BODY AND SAID CONTAINER SIDEWALL DEFINING OPEN AREAS THROUGH SAID SCREEN BODY CONFIGURED AND ARRANGED TO PASS VERTICALLY RISING PULP FROM SAID FIRST CHAMBER TO SAID SECOND CHAMBER; AGITATING MEANS MOUNTED IN SAID FIRST CHAMBER; MEANS FOR INTRODUCING BLEACHING AGENT AND PULP TO SAID FIRST CHAMBER FOR MIXING THEREIN BY SAID AGITATIG MEANS; CONDUIT MEANS COMMUNICATING WITH THE EXTERIOR OF THE CONTAINER AND HAVING INLETS COMMUNICATED WITH SAID FIRST CHAMBER, SAID CONDUIT MEANS BEING CONSTRUCTED AND ARRANGED TO WITHDRAW LIQUID INCLUDING A PART OF SAID BLEACHING AGENT FROM PULP IN SAID FIRST CHAMBER AND DISCHARGE THE LIQUID FROM TEH CONTAINER THEREBY THICKENING THE PULP AS THE PULP PASSINTO SAID SECOND CHAMBER; AND MEANS FOR WITHDRAWING PULP FROM THE SECCHAMBER; AND MEANS FOR WITHDRAWING PULP FROM THE SECOND CHAMBER NEAR THE UPPER END OF THE CONTAINER.
Claim 4
Dependent Claim
247 words
APPARATUS FOR BLEACHING CELLULOSIC PUPL AT A HIGH CONSISTENCY DURING CONTINUOUS VERTICALLY RISING MOVEMENT OF THE PULP, COMPRISING: AN UPRIGHT CYLCINDRICAL CONTAINER; A SCREEN BODY LOCATED IN SAID CONTAINER INTERMEDIATE THE UPPER AND LOWER ENDS THEREOF; SAID SCREEN BODY BEING ROTATABLE ABOUT THE LONGITUDINAL AXIS OF THE CONTAINER AND EXTENDING FROM THE VICINITY OF SAID LONGITUDINAL AXIS TO THE VICINITY OF THE CONTAINER SIDEWALL SO THA TSUBSTANTIALLY THE ENTIRE CROSS-SECTIONAL AREA OF THE CONTAINER IS SWEPT OVER BY SAID SCREEN BODY DURING ROTATION THEREOF, SAID CROSS-SECTIONAL AREA THEREBY DEFINING A FIRST CHAMBER IN SAID CONTAINER BELOW SAID SCREEN BODY AND A SECOND CHAMBER IN SAID CONTAINER ABOVE SAID SCREEN BODY; AND SCREEN BODY AND SAID CONTAINER SIDEWALL DEFINING OPEN AREAS THROUGH SAID SCREEN BODY CONFIGURED AND ARRANGED TO PASS VERTICALLY RISING PULP FROM SAID FIRST CHAMBER TO SAID SECOND CHAMBER; AGITATING MEANS MOUNTED IN SAID FIRST CHAMBER; MEANS FOR INTRODUCING BLEACHING AGENT AND PULP TO SAID FIRST CHAMBER FOR MIXING THEREIN BY SAID AGITATIG MEANS; CONDUIT MEANS COMMUNICATING WITH THE EXTERIOR OF THE CONTAINER AND HAVING INLETS COMMUNICATED WITH SAID FIRST CHAMBER, SAID CONDUIT MEANS BEING CONSTRUCTED AND ARRANGED TO WITHDRAW LIQUID INCLUDING A PART OF SAID BLEACHING AGENT FROM PULP IN SAID FIRST CHAMBER AND DISCHARGE THE LIQUID FROM TEH CONTAINER THEREBY THICKENING THE PULP AS THE PULP PASSINTO SAID SECOND CHAMBER; AND MEANS FOR WITHDRAWING PULP FROM THE SECCHAMBER; AND MEANS FOR WITHDRAWING PULP FROM THE SECOND CHAMBER NEAR THE UPPER END OF THE CONTAINER.
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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) | 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 |