US3795504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for prilling fertilizer melts
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1972-09-07
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Granted: 1974-03-05
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Expires: 1992-09-07
Abstract
Abstract Process for prilling fertilizer melts in which the hot fertilizer melt is sprayed in the upper portion of a tower inside a fluid bed which has a minimum density of 100 kg./m.3 and a settling velocity of the prills of 10 to 20 cm./second. The fluid bed is formed by air under pressure, and dust and powder are introduced in a particular manner. The dust is separated from the prills and introduced to the tower to assist in forming the fluid bed. The prills are cooled as well as powder coated and solidified as they reach the bottom of the tower.
Inventors
- 👤 W Wengeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:59
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/16
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |