Patent US2564028A successfully refreshed from Google Patents.
US2564028A
Expired / Lapsed
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Wood pulp digestion
Assignee: Rayonier Inc
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Filing: 1946-01-17
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Granted: 1951-08-14
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Expires: 1966-01-17
Abstract
No abstract record available.
Inventors
- 👤 Arthur N Parrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:52
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF WOOD PULP DIGESTION WHICH COMPRISES DIGESTING WOOD CHIPS WITH AN AMMONIUM BASE SULFITE COOKING ACID CONTAINING FROM 10 TO 40% OF THE TOTAL SOLIDS PRESENT IN THE WASTE LIQUOR FROM A PRIOR SIMILAR DIGESTION, THE WASTE LIQUOR AT THE END OF DIGESTION CONTAINING FROM 12% TO 17% OF TOTAL SOLIDS, SEPARATING FROM THE DIGESTED PULP FROM 60% TO 90% OF THE WASTE LIQUOR AT SUBSTANTIALLY DIGESTER STRENGTH, WASHING THE DIGESTED PULP CONTAINING THE BALANCE OF THE WASTE LIQUOR TO RECOVER IN THE RESULTING WASH LIQUOR THE BULK OF THE RESIDUAL WASTER LIQUOR REMAINING ASSOCIATED WITH THE PULP, UTILIZ-
Claim 2
Independent Claim
101 words
THE METHOD OF WOOD PULP DIGESTION WHICH COMPRISES DIGESTING WOOD CHIPS WITH AN AMMONIUM BASE SULFITE COOKING ACID CONTAINING FROM 10 TO 40% OF THE TOTAL SOLIDS PRESENT IN THE WASTE LIQUOR FROM A PRIOR SIMILAR DIGESTION, THE WASTE LIQUOR AT THE END OF DIGESTION CONTAINING FROM 12% TO 17% OF TOTAL SOLIDS, SEPARATING FROM THE DIGESTED PULP FROM 60% TO 90% OF THE WASTE LIQUOR AT SUBSTANTIALLY DIGESTER STRENGTH, WASHING THE DIGESTED PULP CONTAINING THE BALANCE OF THE WASTE LIQUOR TO RECOVER IN THE RESULTING WASH LIQUOR THE BULK OF THE RESIDUAL WASTER LIQUOR REMAINING ASSOCIATED WITH THE PULP, UTILIZ-
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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) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |