US3316141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of dewatering sulphate pulp to contain less shives therein
Assignee: Svenska Cellulosa AB
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Filing: 1964-10-02
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Granted: 1967-04-25
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Expires: 1984-10-02
Abstract
No abstract record available.
Inventors
- 👤 Bergholm Carl Arne
- 👤 Malm Gustaf Erik
- 👤 Astrom Johan
- 👤 Sylla Klaus Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:24
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66; Y; Y10; Y10S; Y10S159/00; Y10S159/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR MANUFACTURING SULPHATE CELLULOSE PULP WHICH COMPRISES DEWATERING A PULP HAVING A DRY SOLIDS CONTENT OF AT LEAST 1% BY WEIGHT AND NOT MORE THAN ABOUT 4.5% BY WEIGHT BY A PRESSING OPERATION TO A PRESSED PULP HAVING A DRY SOLIDS, CONTENT OF 40-60%, SUBJECTING THE RESULTING PRESSED PULP TO A FLUFFING OPERATION, AND DRYING THE RESULTING FLUFFED PULP AND CONTACTING IT COCURRENTLY WITH A HEATED DRYING GAS UNTIL ITS AVERAGE DRY CONTENT IS 90 TO 95% BY WEIGHT, THE PULP SLURRY PRIOR TO THE DEWATERING STEP BEING ACIDIFIED SO THAT THE PH OF THE WATER IN THE DEWTERING STEP IS 3-7 AND THE PH OF A BALED AND STORED PULP IS 5-7.
Claim 2
Dependent Claim
115 words
A PROCESS FOR MANUFACTURING SULPHATE CELLULOSE PULP WHICH COMPRISES DEWATERING A PULP HAVING A DRY SOLIDS CONTENT OF AT LEAST 1% BY WEIGHT AND NOT MORE THAN ABOUT 4.5% BY WEIGHT BY A PRESSING OPERATION TO A PRESSED PULP HAVING A DRY SOLIDS, CONTENT OF 40-60%, SUBJECTING THE RESULTING PRESSED PULP TO A FLUFFING OPERATION, AND DRYING THE RESULTING FLUFFED PULP AND CONTACTING IT COCURRENTLY WITH A HEATED DRYING GAS UNTIL ITS AVERAGE DRY CONTENT IS 90 TO 95% BY WEIGHT, THE PULP SLURRY PRIOR TO THE DEWATERING STEP BEING ACIDIFIED SO THAT THE PH OF THE WATER IN THE DEWTERING STEP IS 3-7 AND THE PH OF A BALED AND STORED PULP IS 5-7.
References Cited (Backward Citations)
US1258568A
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US1861184A
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US2409747A
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US2974420A
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US3055795A
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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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |