US3809744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of nitric oxides from exhaust gases
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1972-03-29
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Granted: 1974-05-07
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Expires: 1992-03-29
Abstract
Abstract A PROCESS FOR THE REMOVAL OF NITRIC OXIDES FROM TAIL GASES SUCH AS ARE CONTAINED IN LARGE QUANTITIES IN NITRIC ACID PLANTS. THE TAIL GASES ARE SUCRUBBED WITH A NITRIC VANADIUM (V) SOLUTION, AND THE EFFLUENT SOLUTION IS REGENERATED BY HEATING IT TO A TEMPERATURE RANGING FROM 90* C. TO THE BOILING POINT AND USING AIR AS STRIPPING FLUID. THE REGENERATED VANADIUM SOLUTION IS COOLED AND THEN USED AS SCRUBBING FLUID.
Inventors
- 👤 Semel G Von
- 👤 E Schibilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:29
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |