US3276990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cation permselective membranes
Assignee: Individual
•
Filing: 1961-07-24
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Granted: 1966-10-04
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Hani Hiroshi
- 👤 Nishihara Akira
- 👤 Hiraga Hisao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:49
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
125 words
A PROCESS FOR THE PRODUCTION OF CATION PERMSELECTIVE MEMBRANES WHICH HAVE AN INSOLUBLE, INFUSIBLE SYNTHETIC ORGANIC SOLID POLYMERIC STRUCTURE, A REINFORCING MATERIAL SUPPORTING THE SAID STRUCTURE, AND A DISSOCIABLE SULFONIC GROUP BONDED CHEMICALLY TO THE SAID SOLID POLYMERIC STRUCTURE, COMPRISING IMPREGNATING A LATEX OF LINEAR COPOLYMER OF A MONOVINYL AROMATIC HYDROCARBON AND A CONJUGATED ALIPHATIC POLYENE COMPOUND INTO THE REINFORCING MATERIAL, THE BOUND MONOVINYL AROMATIC HYDROCARBON BEING 20 TIO 75% OF THE COPOLYMER, DRYING TO FROM A MEMBRANE OF THE SAID LINEAR COPOLYMER SUPPORTED BY THE REINFORCING MATERIAL, AND THEN CONTACTING THE SAID MEMBRANE WITH CONCENTRATED SULFURIC ACID, WHEREBY SUL: FONIC GROUPS ARE INTRODUCED INTO THE MEMBRANE AND CONCURRENTLY THEREWITH THE SAID LINEAR COPOLYMER IS CAUSED TO CYCLIZE INTO AN INSOLUBLE, INFUSIBLE THREE DIMENSIONAL NETWORK.
Claim 2
Dependent Claim
125 words
A PROCESS FOR THE PRODUCTION OF CATION PERMSELECTIVE MEMBRANES WHICH HAVE AN INSOLUBLE, INFUSIBLE SYNTHETIC ORGANIC SOLID POLYMERIC STRUCTURE, A REINFORCING MATERIAL SUPPORTING THE SAID STRUCTURE, AND A DISSOCIABLE SULFONIC GROUP BONDED CHEMICALLY TO THE SAID SOLID POLYMERIC STRUCTURE, COMPRISING IMPREGNATING A LATEX OF LINEAR COPOLYMER OF A MONOVINYL AROMATIC HYDROCARBON AND A CONJUGATED ALIPHATIC POLYENE COMPOUND INTO THE REINFORCING MATERIAL, THE BOUND MONOVINYL AROMATIC HYDROCARBON BEING 20 TIO 75% OF THE COPOLYMER, DRYING TO FROM A MEMBRANE OF THE SAID LINEAR COPOLYMER SUPPORTED BY THE REINFORCING MATERIAL, AND THEN CONTACTING THE SAID MEMBRANE WITH CONCENTRATED SULFURIC ACID, WHEREBY SUL: FONIC GROUPS ARE INTRODUCED INTO THE MEMBRANE AND CONCURRENTLY THEREWITH THE SAID LINEAR COPOLYMER IS CAUSED TO CYCLIZE INTO AN INSOLUBLE, INFUSIBLE THREE DIMENSIONAL NETWORK.
References Cited (Backward Citations)
GB804176A
Cited
US2962454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |