US2797151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing nitric acid
Assignee: Ruhrchemie AG
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Filing: 1952-07-18
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Granted: 1957-06-25
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Expires: 1972-07-18
Abstract
No abstract record available.
Inventors
- 👤 Schnur Friedrich
- 👤 Krauel Aloys
- 👤 Schaub Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/38; C01B21/46; C11; C11D; C11D17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
AN APPARATUS FOR THE MANUFACTURE OF NITRIC ACID BY THE ABSORPTION OF NITROUS GASES IN A LIQUID COMPRISING A TOWER HAVING SEVERAL PACKED COMPARTMENTS ARRANGED IN SUPEROSITION, A BOTTOM INLET FOR THE GASES TO BE ABSORBED, A GAS SUCTION PIPE POSITIONED WITHIN SAID TOWER AND TRAVERSING SAID SUPERPOSED COMPARTMENTS, THE PIPE HAVING AN OPEN TOP EXTENDIDNG ABOVE THE UPERMOST LAYER OF PACKING AND HAVING AN OUTLET FOR EXHAUST GASES AT ITS BOTTOM, AN INLET FOR THE ABSORBING LIQUID, AND A BOTTOM OUTLET FOR THE NITRIC ACID, MEANS FOR RECYCLING LIQUID COLLECTING AT THE BOTTOM OF EACH COMPARTMENT IN THAT SAME COMPARTMENT AND INDIVIDUAL COOLING MEANS ADAPTED TO PERMIT INDIVIDUAL CONTROL OF COOLING TEMPERATURES IN THE RECYCLING MEANS OF EACH COMPARTMENT, COLLAR-LIKE VESSELS SURROUNDING SAID PIPE AT THE TOP OF EACH COMPARTMENT EXCEPT THE UPERMOST COMPARTMENT, AN ANNULAR OPENING IN THE BOTTOM OF EACH SUCH VESSEL IN PROXIMITY TO SAID PIPE, AND INLET PIPES TRAVERSING THE WALL OF SAID TOWER AND OPENING INTO EACH VESSEL.
Claim 2
Independent Claim
164 words
AN APPARATUS FOR THE MANUFACTURE OF NITRIC ACID BY THE ABSORPTION OF NITROUS GASES IN A LIQUID COMPRISING A TOWER HAVING SEVERAL PACKED COMPARTMENTS ARRANGED IN SUPEROSITION, A BOTTOM INLET FOR THE GASES TO BE ABSORBED, A GAS SUCTION PIPE POSITIONED WITHIN SAID TOWER AND TRAVERSING SAID SUPERPOSED COMPARTMENTS, THE PIPE HAVING AN OPEN TOP EXTENDIDNG ABOVE THE UPERMOST LAYER OF PACKING AND HAVING AN OUTLET FOR EXHAUST GASES AT ITS BOTTOM, AN INLET FOR THE ABSORBING LIQUID, AND A BOTTOM OUTLET FOR THE NITRIC ACID, MEANS FOR RECYCLING LIQUID COLLECTING AT THE BOTTOM OF EACH COMPARTMENT IN THAT SAME COMPARTMENT AND INDIVIDUAL COOLING MEANS ADAPTED TO PERMIT INDIVIDUAL CONTROL OF COOLING TEMPERATURES IN THE RECYCLING MEANS OF EACH COMPARTMENT, COLLAR-LIKE VESSELS SURROUNDING SAID PIPE AT THE TOP OF EACH COMPARTMENT EXCEPT THE UPERMOST COMPARTMENT, AN ANNULAR OPENING IN THE BOTTOM OF EACH SUCH VESSEL IN PROXIMITY TO SAID PIPE, AND INLET PIPES TRAVERSING THE WALL OF SAID TOWER AND OPENING INTO EACH VESSEL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |