US3041232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuous cellulose digestion and digester apparatus for practicing said method
Assignee: Metso Fiber Karlstad AB
•
Filing: 1958-02-04
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Granted: 1962-06-26
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Expires: 1978-02-04
Abstract
No abstract record available.
Inventors
- 👤 Richter Johan Christoffer Carl
- 👤 Richter Ole Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:20
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A CONTINUOUS PROCESS FOR CELLULOSE DIGESTION OF COMMINUTED CELLULOSE FIBER MATERIAL WHICH COMPRISES FIRST SUCCESSIVELY HEATING SUCCESSIVE PORTIONS OF SAID FIBER MATERIAL BY CONDENSING STEAM THEREON, SUCCESSIVELY INTRODUCING SAID PORTIONS INTO A SINGLE STREAM OF HEATED CIRCULATING DIGESTER LIQUOR IN THE PRESENCE OF SUPERHEATED STEAM AND SUCCESSIVELY CONVEYING SAID PORTIONS OF FIBER MATERIAL TO A DIGESTER IN CO-CURRENT DOWNWARD FLOW WITH SAID DIGESTER LIQUOR WHEREIN THE PRESSURE OF SAID SUPERHEATED STEAM IS AT LEAST SUBSTANTIALLY EQUAL TO THE DIGESTER PRESSURE AND THE TEMPERATURE OF SAID HEATED CIRCULATING LIQUOR IS AT LEAST SUBSTANTIALLY EQUAL TO THE MAXIMUM DIGESTING TEMPERATURE.
Claim 2
Dependent Claim
98 words
A CONTINUOUS PROCESS FOR CELLULOSE DIGESTION OF COMMINUTED CELLULOSE FIBER MATERIAL WHICH COMPRISES FIRST SUCCESSIVELY HEATING SUCCESSIVE PORTIONS OF SAID FIBER MATERIAL BY CONDENSING STEAM THEREON, SUCCESSIVELY INTRODUCING SAID PORTIONS INTO A SINGLE STREAM OF HEATED CIRCULATING DIGESTER LIQUOR IN THE PRESENCE OF SUPERHEATED STEAM AND SUCCESSIVELY CONVEYING SAID PORTIONS OF FIBER MATERIAL TO A DIGESTER IN CO-CURRENT DOWNWARD FLOW WITH SAID DIGESTER LIQUOR WHEREIN THE PRESSURE OF SAID SUPERHEATED STEAM IS AT LEAST SUBSTANTIALLY EQUAL TO THE DIGESTER PRESSURE AND THE TEMPERATURE OF SAID HEATED CIRCULATING LIQUOR IS AT LEAST SUBSTANTIALLY EQUAL TO THE MAXIMUM DIGESTING TEMPERATURE.
References Cited (Backward Citations)
SE122608C1
Cited
SE128264C1
Cited
US1933017A
Cited
US1938802A
Cited
US2359543A
Cited
US2474862A
Cited
US2414062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |