US2962438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange process for water purification
Assignee: Barnstead Still and Sterilizer Co
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Filing: 1955-04-07
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Granted: 1960-11-29
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Expires: 1975-04-07
Abstract
No abstract record available.
Inventors
- 👤 Verity C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:36
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04; B01J49/00; B01J49/05; B01J49/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
IN THE PROCESS OF DEMINERALIZING NATURAL WATER WHICH INCLUDES PASSING SAID WATER IN CONTACT WITH A STRONGLY ACID CATION-EXCHANGE RESIN AND A STRONGLY BASIC ANIONEXCHANGE RESIN WHICH ARE IN RELATIVE AMOUNTS SUFFICIENT TO REMOVE SUBSTANTIALLY ALL OF THE DISSOLVED ELECTROLYTE, FROM SAID WATER AND TO PROVIDE SUBSTANTIALLY PURE WATER,
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |