US3743572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw feeder in a continuous cellulose digester
Assignee: Metso Fiber Karlstad AB
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Filing: 1971-06-09
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Granted: 1973-07-03
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Expires: 1991-06-09
Abstract
Abstract A SCREW FEEDER INSERTED IN THE OP OF A CELLULOSE DIGESTER COMPRISES A VERTICAL DRIVEN CENTER BODY WITH AN EXTERIOR HELICAL FLANGE SURROUNDED BY A SCREEN CASING. THE CENTER BODY IS TUBULAR AND OPEN AT BOTH ENDS, SO THAT FIBER MATERIAL CAN PASS AXIALLY THERETHROUGH. TWO FIBER MATERIAL INLETS ARE ALTERNATELY USED FOR SUPPLYING FIBER MATERIAL AND THE FEEDER SCREW IS REVERSIBLE, SO THAT IT MOVES THE FIBER MATERIAL EITHER DOWNWARDLY OR UPWARDLY PAST THE SCREEN. BY MEANS OF A SPIDER, THE UPPER END OF HE TUBULAR CENTER BODY IS ATTACHED TO A ROTARY VERTICAL SHAFT WHICH IS JOURNALED IN THE TOP OF THE DIGESTER, THE LEGS OF THE SPIDER LEAVE THE SUPPER END OF THE CENTER BODY OPEN.
Inventors
- 👤 J Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:51
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |