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US3427218A
Expired / Lapsed
US
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Method of performing counter-current continuous cellulose digestion
Assignee: Metso Fiber Karlstad AB
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Filing: 1965-07-02
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Granted: 1969-02-11
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Expires: 1985-07-02
Abstract
No abstract record available.
Inventors
- 👤 Johan C F C Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:23
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2474862A
Cited
US3034576A
Cited
US3097987A
Cited
US3243341A
Cited
US3200032A
Cited
US3294623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |