US2757072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of free and combined nitric acid from metal nitrate liquors
Assignee: Individual
•
Filing: 1953-11-19
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Granted: 1956-07-31
•
Expires: 1973-11-19
Abstract
No abstract record available.
Inventors
- 👤 Kapp Numer Martin
- 👤 Weinrich William Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:26
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD FOR THE RECOVERY OF NITRIC ACID FROM AQUEOUS METAL NITRATE LIQUORS WHICH COMPRISES THE STEPS OF CONCENTRATING THE LIQUOR BY PASSING THE SAME IN AN ENCLOSED CYCLIC PATH THROUGH A HEATER AND AN EVAPORATING CHAMBER WHILE HEATING THE LIQUOR UNDER A HYDRAULIC HEAD TO WITHIN A FEW DEGREES OF BOILING TEMPERATURE IN THE HEATER TO PRODUCE NITRIC ACID CONTAINING VAPORS TO RECOVER METAL NITRATE HYDRATES, COLLECTING THE VAPORS TO RECOVER NITRIC ACID THEREFROM, DENITRATING AND DEHYDRATING THE MOLTEN MATERIAL IN A SPRAY CALCINER BY ATOMIZING THE SAME AND INTRODUCING THE ATOMIZED MATERIAL INTO THE CALCINER IN INTIMATE CONTACT WITH A RECIRCULATED STREAM OF HOT GASED TO PRODUCE A MIXTURE COMPRISING METAL OXIDES, NITRIC OXIDES AND HOT GASES, RECIRCULATING THE HOT GASES THUS PRODUCED IN AN ENCLOSED CYCLIC PATH THROUGH A CENTRIFUGAL SOLIDS SEPARATOR, A BLOWER, A GAS HEATER AND THE CALCINER, RECOVERING SEPARATED SOLID METAL OXIDES FROM THE SOLIDS SEPARATOR, AND WITHDRAWING A PORTION OF THE NITROGEN OXIDE-CONTAINING RECIRCULATED GASES FROM THE RECIRCULATION CYCLE TO PRODUCE NITRIC ACID THEREFROM.
Claim 2
Independent Claim
171 words
A METHOD FOR THE RECOVERY OF NITRIC ACID FROM AQUEOUS METAL NITRATE LIQUORS WHICH COMPRISES THE STEPS OF CONCENTRATING THE LIQUOR BY PASSING THE SAME IN AN ENCLOSED CYCLIC PATH THROUGH A HEATER AND AN EVAPORATING CHAMBER WHILE HEATING THE LIQUOR UNDER A HYDRAULIC HEAD TO WITHIN A FEW DEGREES OF BOILING TEMPERATURE IN THE HEATER TO PRODUCE NITRIC ACID CONTAINING VAPORS TO RECOVER METAL NITRATE HYDRATES, COLLECTING THE VAPORS TO RECOVER NITRIC ACID THEREFROM, DENITRATING AND DEHYDRATING THE MOLTEN MATERIAL IN A SPRAY CALCINER BY ATOMIZING THE SAME AND INTRODUCING THE ATOMIZED MATERIAL INTO THE CALCINER IN INTIMATE CONTACT WITH A RECIRCULATED STREAM OF HOT GASED TO PRODUCE A MIXTURE COMPRISING METAL OXIDES, NITRIC OXIDES AND HOT GASES, RECIRCULATING THE HOT GASES THUS PRODUCED IN AN ENCLOSED CYCLIC PATH THROUGH A CENTRIFUGAL SOLIDS SEPARATOR, A BLOWER, A GAS HEATER AND THE CALCINER, RECOVERING SEPARATED SOLID METAL OXIDES FROM THE SOLIDS SEPARATOR, AND WITHDRAWING A PORTION OF THE NITROGEN OXIDE-CONTAINING RECIRCULATED GASES FROM THE RECIRCULATION CYCLE TO PRODUCE NITRIC ACID THEREFROM.
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) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |