US3042491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of caustic alkali by ion exchange
Assignee: Individual
•
Filing: 1957-10-29
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Granted: 1962-07-03
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 David F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:34
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/32; B; B01; B01J; B01J49/00; B01J49/05; B01J49/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A PROCESS FOR REMOVING ANION IMPURITIES SELECTED FROM THE CLASS OCNSISTING OF CHLORIDE AND CHLORATE FROM STRONG AQUEOUS CAUSSTIIC ALKALI HAVING A CONCENTRATION OF FROM 40 TO 55 PERCENT BY WEIGHT BY CONTACT WITH AN ANION EXCHANGER OF THE STRONG BASE TYPE CONTAINING AN ANION EXCHANGEABLE WITH THE ANION IMPLURITY, THE METHOD OF REGENERATING THE EXCHANGER FOR RE-USE WHICH COMPRISES CONTACTING THE EXCHANGER WITH AN AQUEOUS SOLUTION OF A STRONGLY IONZIED ELLECTROLLYTE SELELCTED FROM THE CLALSS CONSISTING OF SOLUBLE ALKALI METAL CARBONATES, SULFATES AND PHOSPHATES AND DISPLACING THE REGENERATING SOLUTION FROM THE EXCHANGER WITH THE STRONG AQUEOUS CAUSTIC ALKALI TO BE PURIFIED, THE SAID REGENERATING SOLUTION BEING AT A CONCENTRATION BELOW 1.0 NORMAL SO AS TO SUBSTANTIALLY AVOID PRECIPITATION OF THE ELELCTROLYTE ON THE EXCHANGER IN CONTACT WITH THE STRONG AQUEOUS CAUSTIC ALKALI.
Claim 2
Dependent Claim
134 words
IN A PROCESS FOR REMOVING ANION IMPURITIES SELECTED FROM THE CLASS OCNSISTING OF CHLORIDE AND CHLORATE FROM STRONG AQUEOUS CAUSSTIIC ALKALI HAVING A CONCENTRATION OF FROM 40 TO 55 PERCENT BY WEIGHT BY CONTACT WITH AN ANION EXCHANGER OF THE STRONG BASE TYPE CONTAINING AN ANION EXCHANGEABLE WITH THE ANION IMPLURITY, THE METHOD OF REGENERATING THE EXCHANGER FOR RE-USE WHICH COMPRISES CONTACTING THE EXCHANGER WITH AN AQUEOUS SOLUTION OF A STRONGLY IONZIED ELLECTROLLYTE SELELCTED FROM THE CLALSS CONSISTING OF SOLUBLE ALKALI METAL CARBONATES, SULFATES AND PHOSPHATES AND DISPLACING THE REGENERATING SOLUTION FROM THE EXCHANGER WITH THE STRONG AQUEOUS CAUSTIC ALKALI TO BE PURIFIED, THE SAID REGENERATING SOLUTION BEING AT A CONCENTRATION BELOW 1.0 NORMAL SO AS TO SUBSTANTIALLY AVOID PRECIPITATION OF THE ELELCTROLYTE ON THE EXCHANGER IN CONTACT WITH THE STRONG AQUEOUS CAUSTIC ALKALI.
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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |