Patent US3137542A successfully refreshed from Google Patents.
US3137542A
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Method of making nitric acid
Assignee: Compagnie de Saint Gobain SA
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Filing: 1961-01-19
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Granted: 1964-06-16
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Expires: 1981-01-19
Abstract
No abstract record available.
Inventors
- 👤 Lerolle Jean-Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:50
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D53/00; B01D53/14; B01D53/18; C01B21/38; C01B21/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD FOR MAKING NITRIC ACID BY THE ABSORPTION AND OXIDATION OF OXIDES FO NITROGEN WHICH COMNRPISES ADMITTING WATER TO THE TOP OF A COLUMN AND NO2 TO THE BOTTOM THEREOF, SAID CLUMN BEING PROVIDED WITH A PLURALITY OF SPACED PLATES DISPOSED SO AS TEMPORARILY TO RETAIN LIQUID THEREON, AND PROVIDING AN INCREASED SPACE BETWEEN SUCCESSIVE PAIRS OF PLATES IN THE UPPER GAS DISCHARGING PORTION OF THE COLUMN AS COMPARED TO THE INTERMEDIATE PORTION OF THE COLUMN, AND INCREASED SPACE BETWEEN SUCCESSIVE PAIRS OF PLATES IN THE INTERMEDIATE PORTION OF THE COLUMN AS COMPARED TO THE LOWER PORTION OF THE COLUMN, AND DISCHARGING HNO3 FROM THE BOTTOM OF THE COLUMN.
Claim 2
Independent Claim
110 words
A METHOD FOR MAKING NITRIC ACID BY THE ABSORPTION AND OXIDATION OF OXIDES FO NITROGEN WHICH COMNRPISES ADMITTING WATER TO THE TOP OF A COLUMN AND NO2 TO THE BOTTOM THEREOF, SAID CLUMN BEING PROVIDED WITH A PLURALITY OF SPACED PLATES DISPOSED SO AS TEMPORARILY TO RETAIN LIQUID THEREON, AND PROVIDING AN INCREASED SPACE BETWEEN SUCCESSIVE PAIRS OF PLATES IN THE UPPER GAS DISCHARGING PORTION OF THE COLUMN AS COMPARED TO THE INTERMEDIATE PORTION OF THE COLUMN, AND INCREASED SPACE BETWEEN SUCCESSIVE PAIRS OF PLATES IN THE INTERMEDIATE PORTION OF THE COLUMN AS COMPARED TO THE LOWER PORTION OF THE COLUMN, AND DISCHARGING HNO3 FROM THE BOTTOM OF THE COLUMN.
References Cited (Backward Citations)
US2142646A
Cited
US2206495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |