US3388058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of acid mine water waste
Assignee: ChampionX LLC
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Filing: 1966-08-03
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Granted: 1968-06-11
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Expires: 1986-08-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Louis F Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/04; B01J39/05
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A METHOD OF PURIFYING ACIDIC MINE DISCHARGE WATER WHICH CONTAINS AS IMPURITIES AT LEAST IRON AND SULFURIC ACID WHICH COMPRISES BRINGING SAID WATER INTO CONTACT WITH AN ANION EXCHANGE RESIN IN THE SULFATE FORM TO REDUCE SAID SULFURIC ACID CONTENT, AND WITH A CATION RESIN IN CALCIUM FORM WHEREBY SAID IRON CONTENT IN SAID WATER IS REDUCED, REGENERATING SAID ANION RESIN BY CONTACT WITH WATER, AND REGENERATING SAID CATION RESIN BY CONTACT WITH A WATERSOLUBLE CALCIUM SALT.
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |