Patent US2319898A successfully refreshed from Google Patents.
US2974101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange assemblies and methods of treating liquids
Assignee: Rohm and Haas Co
•
Filing: 1957-05-22
•
Granted: 1961-03-07
•
Expires: 1977-05-22
Abstract
No abstract record available.
Inventors
- 👤 Jr George A Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/12; B01J47/127
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
A METHOD COMPRISING INTERSPERSING THE MEMBERS OF ONE SET OF A PLURALITY OF FILAMENTOUS STRUCTURES COMPRISING FILAMENTS HAVING ANION-EXCHANGE GROUPS WITH THOSE OF ANOTHER SET OF A PLURALITY OF FILAMENTOUS STRUCTURES COMPRISING FILAMENTS HAVING CATION-EXCHANGE GROUPS TO PROVIDE AN ASSEMBLY OF SUCH STRUCTURES WITH AT LEAST ONE LONG DIMENSION OF THE STURCTURES INCLINED FROM THE HORIZONTAL, SAID STRUCTURES BEING SUSPENDED FROM THEIR UPPER ENDS WITH THEIR LOWER PORTIONS MOVABLE IN LATERAL DIRECTIONS SO THAT THE ASSEMBLY AS A WHOLE IS FREE TO EXPAND AND CONTRACT UNDER THE INFLUENCE OF LIQUID FLOWING FREELY DOWN THE ASSEMBLY BY GRAVITY, DIRECTING A LIQUID CONTAINING IONS ADAPTED TO INTERACT WITH SAID GROUPS TO THE ASSEMBLY AT A POINT ABOVE THE LOWERMOST POINT OF THE ASSEMBLY WHEREBY THE LIQUID FLOWS BY GRAVITY ALONG THE ASSEMBLY WITHOUT CONTACTING ANY SURFACE SURROUNDING THE ASSEMBLY AND ION-EXCHANGE OCCURS DURING SUCH FLOW.
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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |