Patent US3716481A successfully refreshed from Google Patents.
US3716481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal regeneration ion exchange process with triallylamine polymers
Assignee: Orica Ltd
•
Filing: 1971-07-19
•
Granted: 1973-02-13
•
Expires: 1991-07-19
Abstract
Abstract PROCESS FOR THE DEMINERALIZATION OF WATER BY A MIXED BED OF WEAK ACID AND WEAK BASE TYPE ION EXCHANGE RESINS IN WHICH THE MIXED BED IS REGENERATED BY ELUTING IT WITH WATER OR A SALINE SOLUTION AT A TEMPERATURE EXCEEDING THAT EMPLOYED DURING THE ADOSRPTION STAGE. THE PROCESS UTILIZES AS THE WEAK BASE RESIN AT LEAST ONE SOLID POLYMER COMPRISING BETWEEN 3 AND 100 MOLE PEPERCENT OF TRIALLYLAMINE AND A BALANCE OF AT LEAST ONE ALLYLAMINE COMER. THE POLYMER USED IS PREPARED BY EXPOSING THE ALLYLIC MONOMER OR MONOMERS TO A TOTAL DOSE OF FROM 3 TO 20 MEGARADS OF HIGH ENERGY RADIATION AT A TEMPERATURE BETWEEN-80*C. AND + 120*C.
Inventors
- 👤 H Battaerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:02
CPC Classifications
B; B01; B01J; B01J43/00; B01J49/00; B01J49/40
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |