US3348914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering oxides of nitrogen
Assignee: Potasse et Engrais Chimiques SA
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Filing: 1964-04-28
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Granted: 1967-10-24
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Expires: 1984-04-28
Abstract
No abstract record available.
Inventors
- 👤 Quanquin Bernard
- 👤 Trimbach Honore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:12
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR RECOVERING OXIDES OF NITROGEN PRESENT IN INDUSTRIAL GASEOUS EFFLUENTS, AND SAID NITROGEN OXIDES HAVING AN AVERAGE DEGREE OF OXIDATION AT LEAST EQUAL TO N2O3, COMPRISING THE STEPS OF SCRUBBING SAID GSEOUS EFFLUENTS WITH AN AQUEOUS SUSPENSION OF CALCIUM HYDROXIDE IN AN AMOUNT EFFECTIVE TO ABSORB SAID NITROGEN OXIDES AND FORM A SOLUTION CONTAINING LESS THAN ABOUT 65 GRAMS PER LITER OF NITROGEN PRESENT AS CALCIUM NITRITE AND CALCIUM NITRATE, AND ADDING AT LEAST 2 MOLES OF SULFURIC ACID FOR EVERY 3 MOLES OF CALCIUM NITRITE IN SAID SOLUTION WHEREBY SAID NITRITE IS OXIDIZED AND NITRIC OXIDE IS EVOLVED.
Claim 2
Dependent Claim
101 words
A PROCESS FOR RECOVERING OXIDES OF NITROGEN PRESENT IN INDUSTRIAL GASEOUS EFFLUENTS, AND SAID NITROGEN OXIDES HAVING AN AVERAGE DEGREE OF OXIDATION AT LEAST EQUAL TO N2O3, COMPRISING THE STEPS OF SCRUBBING SAID GSEOUS EFFLUENTS WITH AN AQUEOUS SUSPENSION OF CALCIUM HYDROXIDE IN AN AMOUNT EFFECTIVE TO ABSORB SAID NITROGEN OXIDES AND FORM A SOLUTION CONTAINING LESS THAN ABOUT 65 GRAMS PER LITER OF NITROGEN PRESENT AS CALCIUM NITRITE AND CALCIUM NITRATE, AND ADDING AT LEAST 2 MOLES OF SULFURIC ACID FOR EVERY 3 MOLES OF CALCIUM NITRITE IN SAID SOLUTION WHEREBY SAID NITRITE IS OXIDIZED AND NITRIC OXIDE IS EVOLVED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |