US3759783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for bleaching cellulose pulp with alkali and oxygen gas utilizing waste bleaching liquor from an alka line oxygen gas bleaching stage
Assignee: DOMSJO AB
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Filing: 1971-08-23
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Granted: 1973-09-18
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Expires: 1991-08-23
Abstract
Abstract A PROCESS IS PROVIDED FOR BLEACHING CELLULOSE PULP WITH ALKALI IN THE PRESENCE OF OXYGEN GAS AND PARTICULARLY OF AIR, IN WHICH THE CELLULOSE PULP IS IMPREGNATED WITH SPENT PULPING LIQUOR AND WASTE BLEACHING LIQUOR FROM AN ALKALINE OXYGEN GAS BLEACHING STAGE.
Inventors
- 👤 H Samuelson
- 👤 I Croon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:14
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |