US3059280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea prilling
Assignee: WR Grace and Co
•
Filing: 1960-10-27
•
Granted: 1962-10-23
•
Expires: 1980-10-27
Abstract
No abstract record available.
Inventors
- 👤 Albert D Laehder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:10
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
THE PROCESS OF PRILLING MOLTEN UREA, INCLUDES PROVIDING AN INTAKE FOR AIR AT AMBIENT CONDITIONS AT THE TOP OF A PRILLING TOWER, ESTABLISHING A DOWNWARD FLOW OF SAID INTAKE AIR WITHIN THE TOWER AT A VELOCITY NOT IN EXCESS OF 10 FEET A SECOND BY WITHDRAWING THE AIR FROM ADJACENT THE BOTTOM OF THE TOWER, RELEASING DROPLETS OF MOLTEN UREA INTO THE DOWNFLOWING AIR FROM DROPLET RELEASING MEANS LOCATED NEAR THE TOP OF SAID TOWER, WITHDRAWING SUBSTANTIALLY ALL OF THE AIR AND ENTRAINED SMALL PARTICLES OF UREA AND PASSING SAME THROUGH A DUST RECOVERY SYSTEM AND RELEASING AIR TO THE ATMOSPHERE AFTER REMOVAL OF THE ENTRAINED PARTICLES, RECOVERING UREA PRILLS AT THE BOTTOM OF THE TOWER WHILE THE PRILLS ARE AT TEMPERATURES FROM ABOUT
Claim 2
Dependent Claim
124 words
THE PROCESS OF PRILLING MOLTEN UREA, INCLUDES PROVIDING AN INTAKE FOR AIR AT AMBIENT CONDITIONS AT THE TOP OF A PRILLING TOWER, ESTABLISHING A DOWNWARD FLOW OF SAID INTAKE AIR WITHIN THE TOWER AT A VELOCITY NOT IN EXCESS OF 10 FEET A SECOND BY WITHDRAWING THE AIR FROM ADJACENT THE BOTTOM OF THE TOWER, RELEASING DROPLETS OF MOLTEN UREA INTO THE DOWNFLOWING AIR FROM DROPLET RELEASING MEANS LOCATED NEAR THE TOP OF SAID TOWER, WITHDRAWING SUBSTANTIALLY ALL OF THE AIR AND ENTRAINED SMALL PARTICLES OF UREA AND PASSING SAME THROUGH A DUST RECOVERY SYSTEM AND RELEASING AIR TO THE ATMOSPHERE AFTER REMOVAL OF THE ENTRAINED PARTICLES, RECOVERING UREA PRILLS AT THE BOTTOM OF THE TOWER WHILE THE PRILLS ARE AT TEMPERATURES FROM ABOUT
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |