Patent US3004909A successfully refreshed from Google Patents.
US3004909A
Expired / Lapsed
US
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Electropositive selective permeable membrane and method of production
Assignee: ChampionX LLC
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Filing: 1955-06-08
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Granted: 1961-10-17
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Expires: 1975-06-08
Abstract
No abstract record available.
Inventors
- 👤 Harry P Gregor
- 👤 Harold I Patzelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:22
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J2325/00; C08J2325/02; C08J2325/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE METHOD WHICH COMPRISES SUPPLYING A SOLUTION OF AN ELECTROLYTE TO AN ELECTROLYTIC CELL HAVING AN ELECTROPOSITIVE SELECTIVE PERMEABLE MEMBRANE INTERPOSED BETWEEN THE ANODE AND THE CATHODE TO FORM CORRESPONDING COMPARTMENTS, AND PASSING AN ELECTRIC CURRENT THROUGH THE CELL TO DISPLACE THE ANIONS OF THE ELECTROLYTE FROM THE CATHODE COMPARTMENT TO THE ANODE COMPARTMENT, SAID MEMBRANE BEING A CAST HOMOGENEOUS MIXTURE OF 40-90% BY WEIGHT OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER BEING AN ADDITION POLYMER OF AT LEAST ONE MONO-OLEFINIC COMPOUND POLYMERIZED THROUGH THE OLEFINIC GROUP, AND 60-10% BY WEIGHT OF A SUBSTANTIALLY LINEAR WATER-SOLUBLE ELECTROPOSITIVE POLYELECTROLYTE SAID MEMBRANE BEING CAST IN THE FORM OF A FINELY POROUS FILM FROM A SOLUTION OF SAID MIXTURE AND HAVING A MAXIMUM ELECTRICAL RESISTANCE OF 1000 OHMS PER SQUARE CENTIMETER WHEN AT EQUILIBRIUM IN ONE-TENTH NORMAL SODIUM CHLORIDE SOLUTION.
Claim 2
Independent Claim
139 words
THE METHOD WHICH COMPRISES SUPPLYING A SOLUTION OF AN ELECTROLYTE TO AN ELECTROLYTIC CELL HAVING AN ELECTROPOSITIVE SELECTIVE PERMEABLE MEMBRANE INTERPOSED BETWEEN THE ANODE AND THE CATHODE TO FORM CORRESPONDING COMPARTMENTS, AND PASSING AN ELECTRIC CURRENT THROUGH THE CELL TO DISPLACE THE ANIONS OF THE ELECTROLYTE FROM THE CATHODE COMPARTMENT TO THE ANODE COMPARTMENT, SAID MEMBRANE BEING A CAST HOMOGENEOUS MIXTURE OF 40-90% BY WEIGHT OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER BEING AN ADDITION POLYMER OF AT LEAST ONE MONO-OLEFINIC COMPOUND POLYMERIZED THROUGH THE OLEFINIC GROUP, AND 60-10% BY WEIGHT OF A SUBSTANTIALLY LINEAR WATER-SOLUBLE ELECTROPOSITIVE POLYELECTROLYTE SAID MEMBRANE BEING CAST IN THE FORM OF A FINELY POROUS FILM FROM A SOLUTION OF SAID MIXTURE AND HAVING A MAXIMUM ELECTRICAL RESISTANCE OF 1000 OHMS PER SQUARE CENTIMETER WHEN AT EQUILIBRIUM IN ONE-TENTH NORMAL SODIUM CHLORIDE SOLUTION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |