US3820971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizer composition and process
Assignee: Freeport Mcmoran Resource Partners Ltd
•
Filing: 1971-02-22
•
Granted: 1974-06-28
•
Expires: 1991-02-22
Abstract
Abstract A novel melt fertilizer comprising potassium metaphosphate and ammonium nitrate, wherein a chloride-free KPO3 can be derived from wet process phosphoric acid and potassium chloride; other nutrient salts can be incorporated in the melt.
Inventors
- 👤 J Rounsaville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:02
CPC Classifications
C; C05; C05C; C05C1/00; C05B; C05B7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
The composition of claim 1 further including a salt selected from monoammonium phosphate, monopotassium phosphate, potassium nitrate, and ammonium polyphosphate.
Claim 2
Dependent Claim
19 words
The composition of claim 2 wherein the ammonium nitrate and potassium metaphosphate are present in about equal weight proportions.
Claim 3
Independent Claim
81 words
The method of producing a homogeneous fertilizer composition which comprises: a. reacting potassium chloride with phosphoric acid in about equi-molar proportion, b. dehydrating the resulting mixture to produce potassium metaphosphate, c. adding thereto ammonium nitrate in amount of at least about 67 weight percent based on said potassium metaphosphate in a manner such that the resultant material has a temperature of at least about 160*C and comprises a melt, and d. cooling and particulating said melt to form discrete homogeneous granules.
Claim 4
Dependent Claim
31 words
The method of claim 4 wherein there is further added, during step (c), an additional salt selected from the group consisting of monoammonium phosphate, monopotassium phosphate, potassium nitrate, and ammonium polyphosphate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |