US3723308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removal of ammonia from waste water streams
Assignee: Individual
•
Filing: 1970-11-16
•
Granted: 1973-03-27
•
Expires: 1990-11-16
Abstract
Abstract Ammonium ions are selectively removed from aqueous solutions containing alkali and/or alkaline earth cations by cation exchange with zeolite F. This is a synthetic crystalline aluminosilicate having a silica-to-alumina oxide mol ratio of about 2 which is derived from a potassium-rich reaction mixture. This zeolite possesses unusual cation exchange capacity and unpredictable selectivity for the ammonium ion.
Inventors
- 👤 D Breck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:05
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/02; C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/33
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2972516A
Cited
US3033641A
Cited
US3011869A
Cited
US2995423A
Cited
US2991151A
Cited
US3010789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |