US2942967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a calcium phosphate fertilizer with reduced hygroscopicity
Assignee: Individual
•
Filing: 1957-05-20
•
Granted: 1960-06-28
•
Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 Caldwell Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:36
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN THE PREPARATION OF A PHOSPHATE-CONTAINING PLANT FOOD WHEREIN THE PHOSPHATIC COMPONENT IS OBTAINED FROM THE DIGESTION OF PHOSPHATE ROCK WITH AN INORGANIC NITROGENOUS ACID, THE ACID SOLUTION FORMED BEING TREATED WITH POTASSIUM CHLORIDE FOLLOWED BY FLUORINE-COMPONENT PRECIPITATE REMOVAL AND THE FLUORINE FREE COMPONENTS BEING AMMONIATED TO SEPARATE AND RECOVER THE PHOSPHATE THEREFROM, THE PROVISION OF A CALCIUM COMPONENT REMOVAL STEP SUBSEQUENT TO FLUORINE REMOVAL WHEREIN A SULFATING AGENT IS INTRODUCED INTO THE PHOSPHATE AND CALCIUM SULFATE PRECIPITATE IS REMOVED THEREFROM TO REDUCE THE HYGROSCOPICITY OF THE PHOSPHATE PRODUCT, AND AN ACID TREATMENT SUBSEQUENT TO AMMONIATION WHEREIN AN INORGANIC NITROGENOUS ACID IS ADDED TO THE PHOSPHATE PRODUCT TO INCREASE THE WATER SOLUBILITY OF THE PHOSPHATE PRODUCT.
Claim 2
Dependent Claim
116 words
IN THE PREPARATION OF A PHOSPHATE-CONTAINING PLANT FOOD WHEREIN THE PHOSPHATIC COMPONENT IS OBTAINED FROM THE DIGESTION OF PHOSPHATE ROCK WITH AN INORGANIC NITROGENOUS ACID, THE ACID SOLUTION FORMED BEING TREATED WITH POTASSIUM CHLORIDE FOLLOWED BY FLUORINE-COMPONENT PRECIPITATE REMOVAL AND THE FLUORINE FREE COMPONENTS BEING AMMONIATED TO SEPARATE AND RECOVER THE PHOSPHATE THEREFROM, THE PROVISION OF A CALCIUM COMPONENT REMOVAL STEP SUBSEQUENT TO FLUORINE REMOVAL WHEREIN A SULFATING AGENT IS INTRODUCED INTO THE PHOSPHATE AND CALCIUM SULFATE PRECIPITATE IS REMOVED THEREFROM TO REDUCE THE HYGROSCOPICITY OF THE PHOSPHATE PRODUCT, AND AN ACID TREATMENT SUBSEQUENT TO AMMONIATION WHEREIN AN INORGANIC NITROGENOUS ACID IS ADDED TO THE PHOSPHATE PRODUCT TO INCREASE THE WATER SOLUBILITY OF THE PHOSPHATE PRODUCT.
References Cited (Backward Citations)
US2683075A
Cited
US2783140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |