US3554859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of sulphur from furnaced black liquor
Assignee: BC Research (Canada)
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Filing: 1968-07-10
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Granted: 1971-01-12
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Expires: 1988-07-10
Abstract
Abstract SULPHUR CONTAINING COMPOUNDS ARE RECOVERED FROM SULPHUR AND CO2 CONTAINING GASES FROM THE FURNACING OF COOKING LIQUOR IN THE KRAFT OR SODIUM BASE SULPHITE PROCESS BY MIXING THE GASES WITH AIR AND AN OXYGEN-CONTAINING GAS AND CONTACTING THE MIXTURE WITH AN AQUEOUS ALKALINE SOLUTION CONTAINING AT LEAST ONE MOLR CONCENTRATION OF SODIUM IONS WHILE MAINTAINING THE PH OF THE SOLUTION AT 9.0 OR ABOVE AND THE TEMPERATURE THEREOF AT ABOUT 135* TO 180*F.
Inventors
- 👤 Francis E Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; Y; Y02; Y02P; Y02P40/00; Y02P40/40; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
0 OR ABOVE AND THE TEMPERATURE THEREOF AT ABOUT 135* TO 180*F.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |