US2858264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective cation-permeable barriers
Assignee: Stamicarbon BV
•
Filing: 1954-08-27
•
Granted: 1958-10-28
•
Expires: 1974-08-27
Abstract
No abstract record available.
Inventors
- 👤 Geert Jan De Jong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:27
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/422; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J5/2287; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR THE PREPARATION OF A SELECTIVE CATIONPERMEABLE BARRIER WHICH COMPRISES SULPHONATING A FILM OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF NORMALLY SOLID ETHYLENE HOMOPOLYMERS AND COPOLYMERS CONTAINING ETHYLENE AS A MAJOR INGREDIENT WITH CHLOROSULFONIC ACID IN THE DRY STATE AT A TEMPERATURE OF BETWEEN 0* AND 50*C. AND IN THE ABSENCE OF A CATALYST, UNTIL THE ELECTRICAL RESISTANCE PER SQUARE DECIMETER OF PERMEABLE WALL AREA OF SAID ARTICLE IS BELOW 1$.
Claim 2
Dependent Claim
75 words
A PROCESS FOR THE PREPARATION OF A SELECTIVE CATIONPERMEABLE BARRIER WHICH COMPRISES SULPHONATING A FILM OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF NORMALLY SOLID ETHYLENE HOMOPOLYMERS AND COPOLYMERS CONTAINING ETHYLENE AS A MAJOR INGREDIENT WITH CHLOROSULFONIC ACID IN THE DRY STATE AT A TEMPERATURE OF BETWEEN 0* AND 50*C. AND IN THE ABSENCE OF A CATALYST, UNTIL THE ELECTRICAL RESISTANCE PER SQUARE DECIMETER OF PERMEABLE WALL AREA OF SAID ARTICLE IS BELOW 1$.
References Cited (Backward Citations)
US2733231A
Cited
US2212786A
Cited
US2586363A
Cited
US2636852A
Cited
US2681320A
Cited
US2731411A
Cited
US2717888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |