US3687618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of ammonia from exit gases of an ammonium polyphosphate plant
Assignee: Cities Service Co
•
Filing: 1970-12-22
•
Granted: 1972-08-29
•
Expires: 1990-12-22
Abstract
Abstract AMMONIA CAN BE RECOVERED FROM THE EXIT GASES OF AN AMMONIUM POLYPHOSPHATE PLANT BY SCRUBBING THE REACTOR EXIT GASES WITH PARTIALLY AMMONIATED SUPERPHOSPHORIC ACID HAVING A PH ABOVE ABOUT 3, AND RECYCLING THE PRODUCT OBTAINED THEREBY TO THE REACTOR. IN THEIS WAY THE PRODUCTION OF ORTHOPHOSPHATE IS MINIMIZED.
Inventors
- 👤 Herbert J Clausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:53
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/28; C01B25/38; C01B25/40; C01B25/405
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |