US2901340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing concentrated mixtures of nitric and phosphoric acid
Assignee: Pintsch Bamag AG
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Filing: 1956-12-26
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Granted: 1959-08-25
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Semel Georg Von
- 👤 Lehmann Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:37
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C01B25/00; C01B25/16; C01B25/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A METHOD OF PRODUCING CONCENTRATED MIXTURES OF NITRIC ACID AND PHOSPHORIC ACID, THE STEP OF PASSING A NITROGEN OXIDE GAS AND A GAS CONTAINING FREE OXYGEN INTO A DILUTE PHOSPHORIC ACID SOLUTIN HAVING AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE, SODIUM NITRATE, CALCIUM NITRATE, POTASSIUM NITRATE, MAGNESIUM NITRATE AND MAGNESIUM SULFATE DISSOLVED THEREIN IN AN AMOUNT BETWWEEN 1% BY WEIGHT AND THE SOLUBILITY LIMIT OF SAID SALT, WHEREBY SAID NITROGEN OXIDE GAS IS ABSORBED AND CONVERTED TO NITRIC ACID, THE ABSORPTION OF SAID NITROGEN OXIDE GAS BEING PORMOTED BY SAID INORGANIC SALT, THEREBY FORMING A CONCENTRATED MIXTURE OF NITRIC AND PHOSPHORIC ACIDS.
Claim 2
Dependent Claim
107 words
IN A METHOD OF PRODUCING CONCENTRATED MIXTURES OF NITRIC ACID AND PHOSPHORIC ACID, THE STEP OF PASSING A NITROGEN OXIDE GAS AND A GAS CONTAINING FREE OXYGEN INTO A DILUTE PHOSPHORIC ACID SOLUTIN HAVING AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE, SODIUM NITRATE, CALCIUM NITRATE, POTASSIUM NITRATE, MAGNESIUM NITRATE AND MAGNESIUM SULFATE DISSOLVED THEREIN IN AN AMOUNT BETWWEEN 1% BY WEIGHT AND THE SOLUBILITY LIMIT OF SAID SALT, WHEREBY SAID NITROGEN OXIDE GAS IS ABSORBED AND CONVERTED TO NITRIC ACID, THE ABSORPTION OF SAID NITROGEN OXIDE GAS BEING PORMOTED BY SAID INORGANIC SALT, THEREBY FORMING A CONCENTRATED MIXTURE OF NITRIC AND PHOSPHORIC ACIDS.
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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |