US2938824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digestion apparatus and method
Assignee: Metso Fiber Karlstad AB
•
Filing: 1958-01-22
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Granted: 1960-05-31
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Expires: 1978-01-22
Abstract
No abstract record available.
Inventors
- 👤 Johan C F C Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:54
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
IN THE PROCESS OF CONTINUOUSLY DIGESTING CELLULOSE WHEREIN DIGESTING LIQUOR AND PULP ARE DISCHARGED FROM A POINT IN A DIGESTING CHAMBER TO A SEPARATING CHAMBER WHEREIN THE DIGESTING LIQUOR IS SEPARATED FROM THE PULP AT SUBSTANTIALLY THE SAME PRESSURE AS THAT WHICH EXISTS IN THE DIGESTING CHAMBER, SAID PROCESS INCLUDING THE STEPS OF: RETURNING DIGESTING LIQUOR, SEPARATED OFF IN SAID SEPARATING CHAMBER, TO THE DIGESTING CHAMBER ADJACENT THE DISCHARGE POINT AND AT SUBSTANTIALLY THE SAME PRESSURE AS THAT WHICH EXISTS IN THE DIGESTING CHAMBER, AND COOLING THE DIGESTING LIQUOR RETURNED TO THE DIGESTING CHAMBER TO A
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |