US2935194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purity indicator for ion-exchange material
Assignee: Individual
•
Filing: 1955-06-01
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Granted: 1960-05-03
•
Expires: 1975-06-01
Abstract
No abstract record available.
Inventors
- 👤 Tomkin Abraham Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:42
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/42; B; B01; B01J; B01J49/00; B01J49/80; B01J49/85; G; G01; G01N; G01N31/00; G01N31/22; G01N31/221; C02F2201/00; C02F2201/002; C02F2201/006; C02F2209/00; C02F2209/44; C02F2209/445; C02F2305/00; C02F2305/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
WATER PURIFYING MEANS HAVING AN INLET AND AN OUTLET AND INCLUDING ACTIVE CATION EXCHANGE MATERIAL AND ACTIVE ANION EXCHANGE MATERIAL FOR MINERAL REMOVAL PLUS A SUFFICIENT EXCESS ACTIVE CATION EXCHANGE MATERIAL IN COM UINATION WITH A SINGLE AND SEPARATE INDICATING LAYER OF ACTIVE COLOR-CHANGING DYED ANION EXCHANGE MATERIAL DIS
Claim 2
Dependent Claim
49 words
WATER PURIFYING MEANS HAVING AN INLET AND AN OUTLET AND INCLUDING ACTIVE CATION EXCHANGE MATERIAL AND ACTIVE ANION EXCHANGE MATERIAL FOR MINERAL REMOVAL PLUS A SUFFICIENT EXCESS ACTIVE CATION EXCHANGE MATERIAL IN COM UINATION WITH A SINGLE AND SEPARATE INDICATING LAYER OF ACTIVE COLOR-CHANGING DYED ANION EXCHANGE MATERIAL DIS
References Cited (Backward Citations)
US1704925A
Cited
US2781312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |