Patent US2575518A successfully refreshed from Google Patents.
US2575518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange material and use thereof
Assignee: Individual
•
Filing: 1946-11-30
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Granted: 1951-11-20
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Expires: 1966-11-30
Abstract
No abstract record available.
Inventors
- 👤 Holmes Eric Leighton
- 👤 Holmes Lucie Evelyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:55
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A PROCESS OF TREATING WATER CONTAINING BOTH BICARBONATES AND SALTS OF STRONG ACIDS TO REDUCE THE BICARBONATES WITHOUT PRODUCING SUBSTANTIAL QUANTITIES OF FREE MINERAL ACIDITY IN THE WATER WHICH COMPRISES FLOWING SAID WATER THROUGH A BED OF CATION EXCHANGE RESIN CONTAINING A CHANGEABLE HYDROGEN, SAID RESIN COMPRISING A WATER INSOLUBLE REACTION PRODUCT OF A SALT OF CHLORACETIC ACID WITH FORMALDEHYDE AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF PHENOLS AND TANNINS.
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) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |