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US3674630A
Expired / Lapsed
US
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Kraft liquor recovery system including physically isolated oxidation and reduction stages
Assignee: Copeland Systems Inc
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Filing: 1969-11-14
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Granted: 1972-07-04
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Expires: 1989-11-14
Abstract
Abstract D R A W I N G KRAFT BLACK LIQUOR IS TREATED FOR RECOVERY OF ITS HEAT AND CHEMICAL CONTENT BY DRYING TO PRODUCE SOLID MATERIAL, BURNING THE SOLID MATERIAL IN AN OXIDATION FURNACE TO
Inventors
- 👤 George G Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/12; Y; Y10; Y10S; Y10S423/00; Y10S423/03
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |