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US3676100A
Expired / Lapsed
US
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Process for producing a stabilized suspension npk,np or pk fertilizer
Assignee: Knapsack AG
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Filing: 1970-02-19
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Granted: 1972-07-11
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Expires: 1990-02-19
Abstract
Abstract PRODUCTION OF STABILIZED NPK-,NP- OR PK-SUSPENSION FERTILIZERS HAVING AN OVERALL NUTRIENT CONCENTRATION OF AT LEAST 20 GRAMS, PREFERABLY MORE THAN 30 GRAMS, PER 100 GRAMS SUSPENSION FERTILIZER. THE STABILIZER IN THE FERTILIZERS IS A NEUTRIALIZATION SLUDGE OBTAINED IN THE NEUTRALIZATION OF CRUDE PHOSPHORIC ACID PRODUCED BY WET-PROCESSING TREATMENT OF PHOSPHATE ORES WITH THE USE OF AN ALKALI LIQUOR AND/OR AMMONIA.
Inventors
- 👤 Wilfred Gerhardt
- 👤 Heinz Harnisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:14
CPC Classifications
C; C05; C05B; C05B7/00; C05G; C05G5/00; C05G5/20; C05G5/27
Claims Analysis
Total Claims: 0
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |