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Patent US3186941A successfully refreshed from Google Patents.
US3186941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water softening with fine cation exchange tubes
Assignee: Dow Chemical Co
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Filing: 1962-08-02
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Granted: 1965-06-01
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Expires: 1982-08-02
Abstract
No abstract record available.
Inventors
- 👤 William E Skiens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:22
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD FOR SOFTENING HARD WATER BY CATION EXCHANGE WHICH COMPRISES PASSING THE HARD WATER THROUGH A UNIT CONSISTING OF AT LEAST ONE CATION EXCHANGE TUBE HAVING AN OUTSIDE DIAMETER OF LESS THAN 2 M. AND ARRANGED SO THAT THE HARD WATER AND THE REGENERANT SODIUM SALT SOLUTION REQUIRED TO MAINTAIN AT LEST A MINIMUM SOFTENING CAPACITY BY DISPLACING THE ALKALINE EARTH IONS FROM THE CATION EXCHANGE TUBE FLOW SEPARATELY AND INDEPENDENTLY THROUGH THE UNIT, ONE INSIDE THE CATION EXCHANGE TUBE AND THE OTHER OUTSIDE.
Claim 2
Independent Claim
85 words
A METHOD FOR SOFTENING HARD WATER BY CATION EXCHANGE WHICH COMPRISES PASSING THE HARD WATER THROUGH A UNIT CONSISTING OF AT LEAST ONE CATION EXCHANGE TUBE HAVING AN OUTSIDE DIAMETER OF LESS THAN 2 M. AND ARRANGED SO THAT THE HARD WATER AND THE REGENERANT SODIUM SALT SOLUTION REQUIRED TO MAINTAIN AT LEST A MINIMUM SOFTENING CAPACITY BY DISPLACING THE ALKALINE EARTH IONS FROM THE CATION EXCHANGE TUBE FLOW SEPARATELY AND INDEPENDENTLY THROUGH THE UNIT, ONE INSIDE THE CATION EXCHANGE TUBE AND THE OTHER OUTSIDE.
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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |