Patent US2702275A successfully refreshed from Google Patents.
US2702275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing dissolved solids from water
Assignee: Dow Chemical Co
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Filing: 1948-12-29
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Granted: 1955-02-15
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Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 William C Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:17
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR SOFTENING AND DECREASING THE SOLIDS CONTENT OF WATER HAVING PERMANENT HARDNESS CAUSED BY DISSOLVED CALCIUM AND MAGNESIUM COMPOUNDS OF STRONG MINERAL ACIDS WHICH COMPRISES CONTACTING THE WATER SUPPLY WITH A STRONGLY BASIC ANION EXCHANGE RESIN COMPOSED OF THE REACTION PRODUCT OF A VINYL-AROMATIC RESIN HAVING HALOMETHYL RADICALS ATTACHED TO ITS AROMATIC NUCLEI WITH A TERTIARY AMINE AND CONTAINING QUATERNARY AMMONIUM BICARBONATE GROUPS WHEREBY THE DISSOLVED CALCIUM AND MAGNESIUM COMPOUNDS OF THE STRONG MINERAL ACIDS ARE CONVERTED TO CALCIUM AND MAGNESIUM BICARBONATES, THEN BICARBONATES, MIXING WITH THE TREATED WATER AN AMOUNT OF LIME CHEMICALLY EQUIVALENT TO REACT WITH THE CALCIUM AND MAGNESIUM BICARBONATES AND PRECIPITATE CALCIUM CARBONATE AND MAGNESIUM HYDROXIDE, AND SEPARATING THE PRECIPITATE FROM THE WATER.
Claim 2
Dependent Claim
119 words
A PROCESS FOR SOFTENING AND DECREASING THE SOLIDS CONTENT OF WATER HAVING PERMANENT HARDNESS CAUSED BY DISSOLVED CALCIUM AND MAGNESIUM COMPOUNDS OF STRONG MINERAL ACIDS WHICH COMPRISES CONTACTING THE WATER SUPPLY WITH A STRONGLY BASIC ANION EXCHANGE RESIN COMPOSED OF THE REACTION PRODUCT OF A VINYL-AROMATIC RESIN HAVING HALOMETHYL RADICALS ATTACHED TO ITS AROMATIC NUCLEI WITH A TERTIARY AMINE AND CONTAINING QUATERNARY AMMONIUM BICARBONATE GROUPS WHEREBY THE DISSOLVED CALCIUM AND MAGNESIUM COMPOUNDS OF THE STRONG MINERAL ACIDS ARE CONVERTED TO CALCIUM AND MAGNESIUM BICARBONATES, THEN BICARBONATES, MIXING WITH THE TREATED WATER AN AMOUNT OF LIME CHEMICALLY EQUIVALENT TO REACT WITH THE CALCIUM AND MAGNESIUM BICARBONATES AND PRECIPITATE CALCIUM CARBONATE AND MAGNESIUM HYDROXIDE, AND SEPARATING THE PRECIPITATE FROM THE WATER.
References Cited (Backward Citations)
GB392633A
Cited
US2206007A
Cited
US2223930A
Cited
US2341907A
Cited
GB549111A
Cited
US2392105A
Cited
US2404367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |