US3033669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of dicalcium phosphate
Assignee: Fertilizers and Chemicals Ltd
•
Filing: 1960-05-27
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Granted: 1962-05-08
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Expires: 1980-05-27
Abstract
No abstract record available.
Inventors
- 👤 Strauchen Alfred
- 👤 Breslerman Jakow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/12; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/324; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A PROCESS FOR THE MANUFACTURE OF DCP COMPRISING, IN A FIRST STAGE, DECOMPOSING COMMINUTED CALCAREOUS ROCK PHOSPHATE WITH AQUEOUS HYDROCHLORIC ACID TO PRODUCE A LIQUOR HAVING A PH WITHIN THE RANGE FROM 0.3 TO 1.0; SLURRYING SAID LIQUOR, IN A SECOND STAGE, WITH CALCAREOUS ROCK PHOSPHATE TO RAISE THE PH OF THE SLURRY TO WITHIN THE RANGE OF 1.5 TO 2.5; SEPARATING, IN A THIRD STAGE, THE SOLID MATTER OF THE SLURRY PRODUCED IN THE SECOND STAGE FROM THE LIQUID PART THEREOF AND PRECIPITATING FEED-GRADE DCP FROM THE SEPARATED LIQUID BY THE ADDITION TO THE LATTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CALCIUM HYDROXIDE AND CALCIUM CARBONATE; IN A FOURTH STAGE, DISSOLVING IN AQUEOUS HYDROCHLORIC ACID THE SOLID MATTER SEPARATED IN THE THIRD STAGE FROM THE SECOND STAGE SLURRY TO FORM A LIQUOR HAVING A PH IN THE RANGE OF 0.3 TO 1.0; AND PRECIPITATING DCP FROM THE LIQUOR PRODUCED IN THE FOURTH STAGE.
Claim 2
Dependent Claim
157 words
A PROCESS FOR THE MANUFACTURE OF DCP COMPRISING, IN A FIRST STAGE, DECOMPOSING COMMINUTED CALCAREOUS ROCK PHOSPHATE WITH AQUEOUS HYDROCHLORIC ACID TO PRODUCE A LIQUOR HAVING A PH WITHIN THE RANGE FROM 0.3 TO 1.0; SLURRYING SAID LIQUOR, IN A SECOND STAGE, WITH CALCAREOUS ROCK PHOSPHATE TO RAISE THE PH OF THE SLURRY TO WITHIN THE RANGE OF 1.5 TO 2.5; SEPARATING, IN A THIRD STAGE, THE SOLID MATTER OF THE SLURRY PRODUCED IN THE SECOND STAGE FROM THE LIQUID PART THEREOF AND PRECIPITATING FEED-GRADE DCP FROM THE SEPARATED LIQUID BY THE ADDITION TO THE LATTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CALCIUM HYDROXIDE AND CALCIUM CARBONATE; IN A FOURTH STAGE, DISSOLVING IN AQUEOUS HYDROCHLORIC ACID THE SOLID MATTER SEPARATED IN THE THIRD STAGE FROM THE SECOND STAGE SLURRY TO FORM A LIQUOR HAVING A PH IN THE RANGE OF 0.3 TO 1.0; AND PRECIPITATING DCP FROM THE LIQUOR PRODUCED IN THE FOURTH STAGE.
References Cited (Backward Citations)
US2114600A
Cited
US2211918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |