US2731411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive membranes and the like comprising the sulfonated polymerizates of polyvinyl aryl compounds
Assignee: Veolia WTS Systems USA Inc
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Filing: 1951-12-05
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Granted: 1956-01-17
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Expires: 1971-12-05
Abstract
No abstract record available.
Inventors
- 👤 Clarke John Thacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
AS AN ARTICLE OF MANUFACTURE A SOLID INFUSIBLE, UNFRACTURED STRUCTURE IN THE FORM OF A SHEET OR MEMBRANE COMPRISING A COHERENT MATRIX OF AN INSOLUBLE, INFUSIBLE COPOLYMER OF A POLYVINYL AROMATIC COMPOUND AND A MONOVINYL AROMATIC COMPOUND HAVING SULFONIC GROUPS CHEMICALLY BONDED TO THE AROMATIC NUCLEI OF SAID MATRIX, SAID COPOLYMER BEING IN GEL RELATIONSHIP WITH AT LEAST 25 PER CENT, BY VOLUME ON TOTAL VOLUME, OF A COLVATING LIQUID WHICH PRESENTS A CONTINUOUS PHASE THROUGHOUT SAID GEL.
Claim 2
Dependent Claim
78 words
AS AN ARTICLE OF MANUFACTURE A SOLID INFUSIBLE, UNFRACTURED STRUCTURE IN THE FORM OF A SHEET OR MEMBRANE COMPRISING A COHERENT MATRIX OF AN INSOLUBLE, INFUSIBLE COPOLYMER OF A POLYVINYL AROMATIC COMPOUND AND A MONOVINYL AROMATIC COMPOUND HAVING SULFONIC GROUPS CHEMICALLY BONDED TO THE AROMATIC NUCLEI OF SAID MATRIX, SAID COPOLYMER BEING IN GEL RELATIONSHIP WITH AT LEAST 25 PER CENT, BY VOLUME ON TOTAL VOLUME, OF A COLVATING LIQUID WHICH PRESENTS A CONTINUOUS PHASE THROUGHOUT SAID GEL.
References Cited (Backward Citations)
US1811078A
Cited
GB572272A
Cited
US2405817A
Cited
US2366007A
Cited
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Cited
US2636851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |