US3579418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for common digestion of wood chips and saw dust
Assignee: Metso Fiber Karlstad AB
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Filing: 1968-09-18
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Granted: 1971-05-18
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Expires: 1988-09-18
Abstract
Abstract A METHOD AND APPARATUS WHEREIN SAW DUST IS MIXED WITH REGULAR WOOD CHIPS AND DIGESTED. IN ORDER TO PREVENT CLOGGING OF THE SCREENS IN THE CHIPS FEEDING DEVICES AND THE DIGESTER, COHERENT BODIES, FOR EXAMPLE PELLETS OR PLUGS, ARE FORMED OUT OF THE SAW DUST BY COMPRESSION. THE COHESION OF THE BODEIS MAY BE FURTHER IMPROVED BY ADDING AN ADHESIVE OR CEMENTING AGENT. THE SAW DUST BODIES ARE ADDED TO THE CHIPS IN THE CHUTE OF THE HIGH-PRESSURE FEEDER VALVE AND ARE FED TO THE DIGESTER TOP BY CIRCULATING LIQUID. D R A W I N G
Inventors
- 👤 Bengt Sven Erik Ostberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:10
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |