Patent US3148944A successfully refreshed from Google Patents.
US3148944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying aqueous solutions comprised of zinc chloride
Assignee: Dow Chemical Co
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Filing: 1960-05-10
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Granted: 1964-09-15
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Expires: 1980-05-10
Abstract
No abstract record available.
Inventors
- 👤 Christiaan P Van Dijk
- 👤 Robert H Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:07
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE IMPROVEMENT IN THE ART OF PURIFYING AQUEOUS SOLUTIONS COMPRISED OF ZINC CHLORIDE WHOSE HIGHLY CONCENTRATED FORMS ARE SOLVENTS FOR POLYACRYLONITRILE AND WHICH SOLUTIONS CONTAIN AS IMPURITIES METAL ION CONTAMINANTS COMPRISING AT LEAST TRACE AMOUNTS OF MANGANESE AND IRON IONS WHICH COMPRISES THE STEP S: (1) ADJUSTING THE PH OF THE SOLUTION TO A PH BETWEEN ABOUT 5.6 AND ABOUT 10; (2) ADDING TO THE SO ADJUSTED SOLUTION, AT A TEMPERATURE BETWEEN ABOUT 0*C. AND ABOUT 50*C., ABOUT A STOICHIOMETRIC QUANTITY OF POTASSIUM PERMANGANATE IN RESPECT OF THE METAL ION CONTAMINANTS IN SAID SOLUTION THAT ARE OXIDIZABLE BY POTASSIUM PERMANGANATE IN THE SPECIFIED PH RANGE OF INSOLUBLE FORMS; (3) PRECIPITATING THE METAL ION MATERIALS OXIDIZED TO INSOLUBLE FORM BY SAID POTASSIUM PERMANGANATE; AND (4) REMOVING THE PRECIPITATED INSOLUBLE MATERIAL FROM THE PURIFIED SALT SOLUTION; THE TIME FOR PERFORMANCE OF SAID STEPS (2), (3) AND (4) BEING NOT SUBSTANTIALLY IN EXCESS OF ABOUT ONE HOUR.
Claim 2
Dependent Claim
154 words
THE IMPROVEMENT IN THE ART OF PURIFYING AQUEOUS SOLUTIONS COMPRISED OF ZINC CHLORIDE WHOSE HIGHLY CONCENTRATED FORMS ARE SOLVENTS FOR POLYACRYLONITRILE AND WHICH SOLUTIONS CONTAIN AS IMPURITIES METAL ION CONTAMINANTS COMPRISING AT LEAST TRACE AMOUNTS OF MANGANESE AND IRON IONS WHICH COMPRISES THE STEP S: (1) ADJUSTING THE PH OF THE SOLUTION TO A PH BETWEEN ABOUT 5.6 AND ABOUT 10; (2) ADDING TO THE SO ADJUSTED SOLUTION, AT A TEMPERATURE BETWEEN ABOUT 0*C. AND ABOUT 50*C., ABOUT A STOICHIOMETRIC QUANTITY OF POTASSIUM PERMANGANATE IN RESPECT OF THE METAL ION CONTAMINANTS IN SAID SOLUTION THAT ARE OXIDIZABLE BY POTASSIUM PERMANGANATE IN THE SPECIFIED PH RANGE OF INSOLUBLE FORMS; (3) PRECIPITATING THE METAL ION MATERIALS OXIDIZED TO INSOLUBLE FORM BY SAID POTASSIUM PERMANGANATE; AND (4) REMOVING THE PRECIPITATED INSOLUBLE MATERIAL FROM THE PURIFIED SALT SOLUTION; THE TIME FOR PERFORMANCE OF SAID STEPS (2), (3) AND (4) BEING NOT SUBSTANTIALLY IN EXCESS OF ABOUT ONE HOUR.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |