US3147215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demineralisation of water
Assignee: Permutit Co Ltd
•
Filing: 1961-05-16
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Granted: 1964-09-01
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Expires: 1981-05-16
Abstract
No abstract record available.
Inventors
- 👤 Blight Frank Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:52
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR DEMINERALISING WATER COMPRISING PASSING THE WATER FIRST THROUGH A TALL COLUMN COMPOSED OF A CATION-EXCHANGE MATERIAL AND A TRAP ANION-EXCHANGE RESIN HAVING STRONG-BASE GROUPS IN THE SALT FORM, THE CATIONEXCHANGE RESIN BEING PRESENT IN SUBSTANTIALLY GREATER QUANTITY THAN THE ANION-EXCHANGE RESIN AND THEREAFTER IN CONTACT WITH AN ANION-EXCHANGE RESIN.
Claim 2
Dependent Claim
52 words
A PROCESS FOR DEMINERALISING WATER COMPRISING PASSING THE WATER FIRST THROUGH A TALL COLUMN COMPOSED OF A CATION-EXCHANGE MATERIAL AND A TRAP ANION-EXCHANGE RESIN HAVING STRONG-BASE GROUPS IN THE SALT FORM, THE CATIONEXCHANGE RESIN BEING PRESENT IN SUBSTANTIALLY GREATER QUANTITY THAN THE ANION-EXCHANGE RESIN AND THEREAFTER IN CONTACT WITH AN ANION-EXCHANGE RESIN.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |