Patent US2648153A successfully refreshed from Google Patents.
Patent US2493915A successfully refreshed from Google Patents.
US2493915A
Expired / Lapsed
US
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Phosphoric acid
Assignee: KANSAS CITY TESTING LAB
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Filing: 1946-01-10
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Granted: 1950-01-10
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Expires: 1966-01-10
Abstract
No abstract record available.
Inventors
- 👤 Forbes Cross And First Na Mary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:40
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE METHOD OF MAKING PHOSPHORIC ACID FROM CALCIUM PHOSPHATE MATERIAL WHICH COMPRISES REACTING THE CALCIUM PHOSPHATE MATERIAL IN A TOWER BY INTRODUCING INTO THE TOWER AND PASSING UPWARDLY THROUGH THE CALCIUM PHOSPHATE MATERIAL THEREIN A GASEOUS REAGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN FLUORIDE UNDER CONDITIONS IN WHICH A MINIMUM AMOUNT OF MOISTURE IS PRESENT SO AS TO RELEASE THE PHOSPHORIC ACID IN AS NEARLY AN ANHYDROUS CONDITION AS POSSIBLE AND TO FORM A HALOGEN SALT OF CALCIUM, INTRODUCING INTO THE TOWER AND PASSING DOWNWARDLY THROUGH THE CALCIUM PHOSPHATE MATERIAL AND COUNTERCURRENT TO THE REAGENT AND CONTEMPORANEOUSLY THEREWITH A VOLATILE ORGANIC SOLVENT WHICH SELECTIVELY DISSOLVES THE PHOSPHORIC ACID IN SITU FROM THE HALOGEN CALCIUM SALT AS IT IS FORMED, AND RECOVERING THE PHOSPHORIC ACID FROM THE ORGANIC SOLVENT.
Claim 2
Independent Claim
132 words
THE METHOD OF MAKING PHOSPHORIC ACID FROM CALCIUM PHOSPHATE MATERIAL WHICH COMPRISES REACTING THE CALCIUM PHOSPHATE MATERIAL IN A TOWER BY INTRODUCING INTO THE TOWER AND PASSING UPWARDLY THROUGH THE CALCIUM PHOSPHATE MATERIAL THEREIN A GASEOUS REAGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN FLUORIDE UNDER CONDITIONS IN WHICH A MINIMUM AMOUNT OF MOISTURE IS PRESENT SO AS TO RELEASE THE PHOSPHORIC ACID IN AS NEARLY AN ANHYDROUS CONDITION AS POSSIBLE AND TO FORM A HALOGEN SALT OF CALCIUM, INTRODUCING INTO THE TOWER AND PASSING DOWNWARDLY THROUGH THE CALCIUM PHOSPHATE MATERIAL AND COUNTERCURRENT TO THE REAGENT AND CONTEMPORANEOUSLY THEREWITH A VOLATILE ORGANIC SOLVENT WHICH SELECTIVELY DISSOLVES THE PHOSPHORIC ACID IN SITU FROM THE HALOGEN CALCIUM SALT AS IT IS FORMED, AND RECOVERING THE PHOSPHORIC ACID FROM THE ORGANIC SOLVENT.
References Cited (Backward Citations)
US1313379A
Cited
US1018746A
Cited
US1929442A
Cited
US1969951A
Cited
US1981145A
Cited
GB464370A
Cited
US2152364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |