US3753899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed bed deionization
Assignee: Rohm and Haas Co
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Filing: 1972-02-04
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Granted: 1973-08-21
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Expires: 1992-02-04
Abstract
Abstract AN IMPROVED MIXED HELD BED DEIONIZATION SYSTEM COMPRISING A MIXTURE OF CATION AND ANION EXCHANGE RESINS IN INTIMATE ASSOCIATION WITH ONE ANOTHER, AND MORE PARTICULARLY, A MIXED BED SYSTEM COMPRISING A MIXTURE OF STRONG ACID CATION EXCHANGE RESINS AND WEAK BASE ANION EXCHANGE RESINS WITH CERTAIN CRITICAL KINETIC CHARACTERISTICS, IS DISCLOSED AND CLAIMED.
Inventors
- 👤 R Kunin
- 👤 P Kittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:19
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |