US3329478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing nitrogen oxides from gases
Assignee: Office National Industriel de lAzote
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Filing: 1963-07-08
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Granted: 1967-07-04
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Expires: 1983-07-08
Abstract
No abstract record available.
Inventors
- 👤 Garlet Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A METHOD OF REDUCING THE NITROGEN-OXIDE CONTENT OF TAIL GASES TO REDUCE AIR POLLUTION COMPRISING PASSING SAID TAIL GASES CONTAINING SMALL QUANTITIES, NOT SUBSTANTIALLY GREATER THAN ABOUT 0.5% BY VOLUME, OF NITROGEN OXIDE HAVING AN OXIDATION DEGREE ABOVE 2 INTO AN ESSENTIALLY VERTICAL WASHING COLUMN AT A SPACE VELOCITY OF 1,300 TO 1,500 VOLUME UNITS OF GAS PER HOUR PER EFFECTIVE VOLUME UNIT OF WASHING COLUMN AND INTO CONTACT THEREIN WITH AN AQUEOUS SOLUTION OF AMMONIUM SULFITE AND BISULFITE, THE MOLAR RATIO OF BISULFITE TO SULFITE LYING WITHIN THE RANGE 0.1 TO 0.4; WASHING AND REACTING SAID NITROGEN-OXIDE WITH SAID AMMONIUM SULFITE AND BISULFITE UNDER AMBIENT CONDITIONS OF TEMPERATURES AND PRESSURE WITHIN SAID WASHING COLUMN TO REDUCE THE LEVEL OF NITROGEN-OXIDE CONTENT OF SAID TAIL GASES; AND DISCHARGING SAID TAIL GASES OF REDUCED NITROGEN OXIDE CONTENT TO THE ATMOSPHERE, SAID NITROGEN-OXIDE CONTENT OF THE ATMOSPHERE IN THE VICINITY OF TAIL GAS DISCHARGE BEING THEREBY REDUCED TO ABOUT 10 P.P.M.
Claim 2
Independent Claim
159 words
A METHOD OF REDUCING THE NITROGEN-OXIDE CONTENT OF TAIL GASES TO REDUCE AIR POLLUTION COMPRISING PASSING SAID TAIL GASES CONTAINING SMALL QUANTITIES, NOT SUBSTANTIALLY GREATER THAN ABOUT 0.5% BY VOLUME, OF NITROGEN OXIDE HAVING AN OXIDATION DEGREE ABOVE 2 INTO AN ESSENTIALLY VERTICAL WASHING COLUMN AT A SPACE VELOCITY OF 1,300 TO 1,500 VOLUME UNITS OF GAS PER HOUR PER EFFECTIVE VOLUME UNIT OF WASHING COLUMN AND INTO CONTACT THEREIN WITH AN AQUEOUS SOLUTION OF AMMONIUM SULFITE AND BISULFITE, THE MOLAR RATIO OF BISULFITE TO SULFITE LYING WITHIN THE RANGE 0.1 TO 0.4; WASHING AND REACTING SAID NITROGEN-OXIDE WITH SAID AMMONIUM SULFITE AND BISULFITE UNDER AMBIENT CONDITIONS OF TEMPERATURES AND PRESSURE WITHIN SAID WASHING COLUMN TO REDUCE THE LEVEL OF NITROGEN-OXIDE CONTENT OF SAID TAIL GASES; AND DISCHARGING SAID TAIL GASES OF REDUCED NITROGEN OXIDE CONTENT TO THE ATMOSPHERE, SAID NITROGEN-OXIDE CONTENT OF THE ATMOSPHERE IN THE VICINITY OF TAIL GAS DISCHARGE BEING THEREBY REDUCED TO ABOUT 10 P.P.M.
References Cited (Backward Citations)
US2011307A
Cited
US2095074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |