Patent US2709649A successfully refreshed from Google Patents.
US2709649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing phosphate material
Assignee: International Minerals and Chemical Corp
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Filing: 1950-09-26
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Granted: 1955-05-31
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Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Baron Ira M Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:06
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS OF RECOVERING AVAILABLE PHOSPHATIC MATERIAL WHICH COMPRISES ADMIXING GROUND PHOSPHATE ROCKPARTICLES BETWEEN ABOUT 48% AND ABOUT 80% OF WHICH WILL PASS THROUGH A 200 MESH STANDARD SCREEN WITH AQUEOUS SULFURIC ACID OF A STRENGTH IN THE RANGE OF APPROXIMATELY 50% TO APPROXIMATELY 70% SULFURIC ACID, LEACHING THE SOLUBLE PHOSPHATE CONSTITUENTS FROM THE ACID MIX, SEPARATING UNDISSOLVED SOLIDS FROM THE SOLUTION OF DISSOLVED PHOSPHATIC SOLID, SEGREGATING THE UNDISSOLVED SOLIDS INTO PORTIONS, ONE OF WHICH CONTAINS PARTICLES OF A CLASS SMALLER THAN 150 TO 250 MESH AND THE OTHER PORTION
Claim 2
Dependent Claim
90 words
A PROCESS OF RECOVERING AVAILABLE PHOSPHATIC MATERIAL WHICH COMPRISES ADMIXING GROUND PHOSPHATE ROCKPARTICLES BETWEEN ABOUT 48% AND ABOUT 80% OF WHICH WILL PASS THROUGH A 200 MESH STANDARD SCREEN WITH AQUEOUS SULFURIC ACID OF A STRENGTH IN THE RANGE OF APPROXIMATELY 50% TO APPROXIMATELY 70% SULFURIC ACID, LEACHING THE SOLUBLE PHOSPHATE CONSTITUENTS FROM THE ACID MIX, SEPARATING UNDISSOLVED SOLIDS FROM THE SOLUTION OF DISSOLVED PHOSPHATIC SOLID, SEGREGATING THE UNDISSOLVED SOLIDS INTO PORTIONS, ONE OF WHICH CONTAINS PARTICLES OF A CLASS SMALLER THAN 150 TO 250 MESH AND THE OTHER PORTION
References Cited (Backward Citations)
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US1902648A
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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) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |