US3695828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purification of exhaust gases from nitric oxides
Assignee: PERM POLT I
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Filing: 1970-04-14
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Granted: 1972-10-03
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Expires: 1990-04-14
Abstract
Abstract A METHOD OF PURIFICATION OF EXHAUST GASES FROM NITRIC OXIDES WHEREIN THE EXHAUST GASES ARE SUBJECTED TO SORPTION WITH AN ALKALINE REAGENT FOR REMOVING HIGHER OXIDES, THEN THE GAS IS CONTACTED WITH PYRITE FES2 SPRAYED WITH WATER, IN WHICH CASE THE BASIC PORTION OF THE NITRIC OXIDE IS REDUCED TO ELEMENTARY NITROEN, AFTER WHICH THE PURIFIED GAS WITH RESIDUAL NITRIC OXIDE IS CONTACTED WITH CARBON MONOXIDE SO THAT THE RESIDUAL NITRIC OXIDE IS REDUCED TO ELEMENTARY NITROGEN.
Inventors
- 👤 Petr Petrovich Gertsen
- 👤 Taisia Georgievna Suverneva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:18
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |