US3197401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for regenerating weakly basic anion exchange resin
Assignee: Rohm and Haas Co
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Filing: 1963-12-27
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Granted: 1965-07-27
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Expires: 1983-12-27
Abstract
No abstract record available.
Inventors
- 👤 Arai Yoshinori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:52
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05; B01J49/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A PROCESS FOR DEIONIZING WATER WHICH CONSISTS ESSENTIALLY OF PASSING WATER TO BE TREATED IN CONTACT WITH A STRONGLY ACIDIC CATION EXCHANGER, THEN PASSING THE WATER IN CONTACT WITH A WEAKLY BASIC ANION EXCHANGER, AND NEXT PASSING THE WATER IN CONTACT WITH A STRONGLY BASIC ANION EXCHANGER, THE METHOD OF REGENERATING THE WEAKLY BASIC ANION EXCHANGER WHICH COMPRISES FIRST PASSING CAUSTIC IN CONTACT WITH THE STRONGLY BASIC ANION EXCHANGER, COLLECTING THE EFFUENT SILICA-CONTAINING WASTE CAUSTIC FROM THE STRONGLY BASIC EXCHANGER AND DILUTING AT LEAST A PORTION OF THAT WASTE CAUSTIC WITH A DILUENT SELECTED FROM THE CLASS CONSISTING OF UNTREATED RAW WATER, DEIONIZED WATER, AND ACIDIC SOFT WATER UNTIL THE SILICA CONCENTRATION IN THE EFFLUENT IS BELOW ABOUT 1%, THEN PASSING THE THUS DILUTED EFFLUENT IN CONTACT WITH SAID WEAKLY BASIC ANION EXCHANGER SO AS THEREBY TO REGENERATE THE WEAKLY BASIC EXCHANGER.
Claim 2
Dependent Claim
143 words
IN A PROCESS FOR DEIONIZING WATER WHICH CONSISTS ESSENTIALLY OF PASSING WATER TO BE TREATED IN CONTACT WITH A STRONGLY ACIDIC CATION EXCHANGER, THEN PASSING THE WATER IN CONTACT WITH A WEAKLY BASIC ANION EXCHANGER, AND NEXT PASSING THE WATER IN CONTACT WITH A STRONGLY BASIC ANION EXCHANGER, THE METHOD OF REGENERATING THE WEAKLY BASIC ANION EXCHANGER WHICH COMPRISES FIRST PASSING CAUSTIC IN CONTACT WITH THE STRONGLY BASIC ANION EXCHANGER, COLLECTING THE EFFUENT SILICA-CONTAINING WASTE CAUSTIC FROM THE STRONGLY BASIC EXCHANGER AND DILUTING AT LEAST A PORTION OF THAT WASTE CAUSTIC WITH A DILUENT SELECTED FROM THE CLASS CONSISTING OF UNTREATED RAW WATER, DEIONIZED WATER, AND ACIDIC SOFT WATER UNTIL THE SILICA CONCENTRATION IN THE EFFLUENT IS BELOW ABOUT 1%, THEN PASSING THE THUS DILUTED EFFLUENT IN CONTACT WITH SAID WEAKLY BASIC ANION EXCHANGER SO AS THEREBY TO REGENERATE THE WEAKLY BASIC EXCHANGER.
References Cited (Backward Citations)
US2606870A
Cited
US2926110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |