Patent US2957206A successfully refreshed from Google Patents.
US2957206A
Expired / Lapsed
US
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Production of ion selective permeable membrane and composition therefor
Assignee: ChampionX LLC
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Filing: 1957-07-22
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Granted: 1960-10-25
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Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Mindick Morris
- 👤 Harold I Patzelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
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: 4
Claim 1
Independent Claim
29 words
IN A METHOD OF PRODUCING AN ION SELECTIVE PERMEABLE MEMBRANCE OF A HOMOGENOUS MOLECULAR DISPERSION OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER AND A LINEAR POLYELECTROLYTE, THE
Claim 2
Dependent Claim
29 words
IN A METHOD OF PRODUCING AN ION SELECTIVE PERMEABLE MEMBRANCE OF A HOMOGENOUS MOLECULAR DISPERSION OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER AND A LINEAR POLYELECTROLYTE, THE
Claim 3
Dependent Claim
27 words
A COMPOSITION FOR CASTING AN ARTICLE HAVING ION EXCHANGE PROPERTIES COMPRISING A BUTYROLACTONE SOLUTION OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER AND A LINEAR POLYELECTROLYTE.
Claim 4
Dependent Claim
27 words
A COMPOSITION FOR CASTING AN ARTICLE HAVING ION EXCHANGE PROPERTIES COMPRISING A BUTYROLACTONE SOLUTION OF A WATER-INSOLUBLE, ACID AND ALKALI-RESISTANT THERMOPLASTIC FILM-FORMING POLYMER AND A LINEAR POLYELECTROLYTE.
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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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |