Patent US2968544A successfully refreshed from Google Patents.
US2968544A
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Method and means for dissolving crude phosphates with acids
Assignee: Chemische Fabrik Kalk GmbH
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Filing: 1956-07-12
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Granted: 1961-01-17
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Expires: 1976-07-12
Abstract
No abstract record available.
Inventors
- 👤 Zeitz Willi
- 👤 Nees Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:22
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1868; B01J19/1875; B01J19/1862; C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS OF DISSOLVING UNCALCINED CRUDE PHOSPHATE, COMPRISING MIXING THE CRUDE PHOSPHATE WITH STRONG INORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, SULPHURIC ACID, PHOSPHORIC ACID AND MIXTURES THEREOF IN ONE OF THE FIRST TWO VESSELS OF A SERIES OF INTERCONNECTED MIXING VESSELS THROUGH WHICH THE REACTION MIXTURE FLOWS SUCCESSIVELY, CONDUCTING A PORTION OF THE REACTION PRODUCT BACK FROM THE LAST VESSEL OF THE SERIES TO ONE OF THE FIRST TWO VESSELS OF THE SERIES AND IN MAINTAINING THE REACTION MIXTURE IN AT LEAST ONE OF THE FIRST TWO VESSELS OF THE SERIES A CONTINUOUS CIRCULATION FROM THE BOTTOM TO THE TOP IN THE CENTRAL ZONE OF THE VESSEL AND FROM THE TOP TO THE BOTTOM IN THE ZONE ADJACENT THE WALL OF THE VESSEL BESIDE THE ROTATION OF THE REACTION MIXTURE AROUND THE CENTER OF THE MIXING VESSEL.
Claim 2
Dependent Claim
141 words
A PROCESS OF DISSOLVING UNCALCINED CRUDE PHOSPHATE, COMPRISING MIXING THE CRUDE PHOSPHATE WITH STRONG INORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, SULPHURIC ACID, PHOSPHORIC ACID AND MIXTURES THEREOF IN ONE OF THE FIRST TWO VESSELS OF A SERIES OF INTERCONNECTED MIXING VESSELS THROUGH WHICH THE REACTION MIXTURE FLOWS SUCCESSIVELY, CONDUCTING A PORTION OF THE REACTION PRODUCT BACK FROM THE LAST VESSEL OF THE SERIES TO ONE OF THE FIRST TWO VESSELS OF THE SERIES AND IN MAINTAINING THE REACTION MIXTURE IN AT LEAST ONE OF THE FIRST TWO VESSELS OF THE SERIES A CONTINUOUS CIRCULATION FROM THE BOTTOM TO THE TOP IN THE CENTRAL ZONE OF THE VESSEL AND FROM THE TOP TO THE BOTTOM IN THE ZONE ADJACENT THE WALL OF THE VESSEL BESIDE THE ROTATION OF THE REACTION MIXTURE AROUND THE CENTER OF THE MIXING 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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |