Patent US3049405A successfully refreshed from Google Patents.
Patent US2798301A successfully refreshed from Google Patents.
US2798301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying ammonium nitrate prills
Assignee: Phillips Petroleum Co
•
Filing: 1954-07-06
•
Granted: 1957-07-09
•
Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Antle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:33
CPC Classifications
C; C05; C05C; C05C1/00; C05C1/02; C01; C01C; C01C1/00; C01C1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
IN THE PRODUCTION OF AMMONIUM NITRATE PRILLS WHEREIN MOLTEN AMMONIUM NITRATE, CONTAINING ABOUT 5 WEIGHT PERCENT WATER, IS SPRAYED INTO THE TOP OF A PRILLING TOWER COUNTERCURRENT TO A FLOW OF COOLING GAS THE IMPROVEMENT WHICH COMPRISES COLLECTING THE PRILLS AT THE BOTTOM OF THE PRILLING TOWER AT A TEMPERATURE IN THE RANGE 70 TO 100* C., PASSING THE PRILLS AT A TEMPERATURE IN THE RANGE OF 60 TO 90*C. THROUGH A PREDRYING ZONE; PASSING AIR THROUGH SAID PREDRYING ZONE, SAID AIR HAVING A RELATIVE HUMIDITY OF 70 TO 90 PERCENT AT 35 TO 38*C. AND A TEMPERATURE SUFFICIENT TO RAISE THE TEMPERATURE OF THE PRILLS FROM ABOUT 1*C. TO ABOUT 5*C., PASSING SAID PRILLS THROUGH A DRYING ZONE; PASSING AIR THROUGH SAID DRYING ZONE, SAID AIR HAVING A RELATIVE HUMIDITY OF LESS THAN 60 PERCENT AT 35 TO 38*C. AND A TEMPERATURE SUFFICIENT TO RAISE THE TEMPERATURE OF THE PRILLS FROM ABOUT 1*C. TO ABOUT 5* C., PASSING SAID PRILLS THROUGH A COOLING ZONE; PASSING AIR THROUGH SAID COOLING ZONE; SAID AIR HAVING A RELATIVE HUMIDITY OF LESS THAN 60 PERCENT AT THE ENTRANCE TEMPERATURE AND AT A TEMPERATURE SUFFICIENT TO LOWER THE TEMPERATURE OF THE PRILLS TO ABOUT 45-50*C., AND RECOVERING RESULTING DRIED PRILLS.
Claim 2
Dependent Claim
206 words
IN THE PRODUCTION OF AMMONIUM NITRATE PRILLS WHEREIN MOLTEN AMMONIUM NITRATE, CONTAINING ABOUT 5 WEIGHT PERCENT WATER, IS SPRAYED INTO THE TOP OF A PRILLING TOWER COUNTERCURRENT TO A FLOW OF COOLING GAS THE IMPROVEMENT WHICH COMPRISES COLLECTING THE PRILLS AT THE BOTTOM OF THE PRILLING TOWER AT A TEMPERATURE IN THE RANGE 70 TO 100* C., PASSING THE PRILLS AT A TEMPERATURE IN THE RANGE OF 60 TO 90*C. THROUGH A PREDRYING ZONE; PASSING AIR THROUGH SAID PREDRYING ZONE, SAID AIR HAVING A RELATIVE HUMIDITY OF 70 TO 90 PERCENT AT 35 TO 38*C. AND A TEMPERATURE SUFFICIENT TO RAISE THE TEMPERATURE OF THE PRILLS FROM ABOUT 1*C. TO ABOUT 5*C., PASSING SAID PRILLS THROUGH A DRYING ZONE; PASSING AIR THROUGH SAID DRYING ZONE, SAID AIR HAVING A RELATIVE HUMIDITY OF LESS THAN 60 PERCENT AT 35 TO 38*C. AND A TEMPERATURE SUFFICIENT TO RAISE THE TEMPERATURE OF THE PRILLS FROM ABOUT 1*C. TO ABOUT 5* C., PASSING SAID PRILLS THROUGH A COOLING ZONE; PASSING AIR THROUGH SAID COOLING ZONE; SAID AIR HAVING A RELATIVE HUMIDITY OF LESS THAN 60 PERCENT AT THE ENTRANCE TEMPERATURE AND AT A TEMPERATURE SUFFICIENT TO LOWER THE TEMPERATURE OF THE PRILLS TO ABOUT 45-50*C., AND RECOVERING RESULTING DRIED PRILLS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |