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US3810833A
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Purification processes
Assignee: North Western Gas Board
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Filing: 1972-08-24
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Granted: 1974-05-14
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Expires: 1992-08-24
Abstract
Abstract AN EFFLUENT PURIFICATION PROCESS FOR REMOVING VANADIUM SALTS, SODIUM ANTHRAQUINONE DISULPHONATES AND DI-HYDROXYANTHRAQUINONES FROM EFFLUENT LIQUORS WHICH HAVE BEEN USED IN PROCESSES FOR REMOVING HYDROGEN SULPHIDE FROM FUEL GASES OR LIQUID HYDROCARBONS COMPRISES THE SLIPS OF PASSING THE LIQUOR THROUGH AN ADSORBENT BED TO REMOVE THE ANTHRAQUINONE COMPOUNDS AND THROUGH AN ION EXCHANGE MATERIAL TO REMOVE THE VANADIUM COMPOUNDS.
Inventors
- 👤 T Nicklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:55
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/04; B01D; B01D53/00; B01D53/02; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; C01B32/00; C01B32/30; C01B32/354; C01B32/36; C01G; C01G31/00; C01G31/003; C02; C02F; C02F1/00; C02F1/28; C02F1/281; C02F1/283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |