Patent US4976860A successfully refreshed from Google Patents.
US4976860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conjugated polymer-cation exchanger composite membrane
Assignee: Kao Corp
•
Filing: 1988-08-04
•
Granted: 1990-12-11
•
Expires: 2008-08-04
Abstract
Abstract Disclosed is a conjugated polymer-cation exchanger composite membrane suitable for a charge-mosaic membrane which is easily prepared and has excellent mechanical or chemical strength and good properties for charge-mosaic membrane. The composite membrane of the present invention comprises a conjugated polymer and cation exchangers dispersed therein.
Inventors
- 👤 Hiromichi Takahashi
- 👤 Kaoru Tsujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:34
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
46 words
A conjugated polymer-cation exchanger composite membrane which consists essentially of a conjugated polymer and cation exchangers dispersed therein, said conjugated polymer being selected from the group consisting of polypyrrole, polythiophene, polyfurane, polyselenophene, polyaniline, polypyridazine, polyazophenylene, poly-p-phenylene, polynaphthalene, polyanthracene, polyacetylene, polyacene, poly-p-phenylenevinylene or a substituted derivative thereof.
Claim 2
Dependent Claim
46 words
A conjugated polymer-cation exchanger composite membrane which consists essentially of a conjugated polymer and cation exchangers dispersed therein, said conjugated polymer being selected from the group consisting of polypyrrole, polythiophene, polyfurane, polyselenophene, polyaniline, polypyridazine, polyazophenylene, poly-p-phenylene, polynaphthalene, polyanthracene, polyacetylene, polyacene, poly-p-phenylenevinylene or a substituted derivative thereof.
Claim 3
Dependent Claim
16 words
The composite membrane according to claim 1 wherein the membrane is supported on a porous support.
Claim 4
Dependent Claim
26 words
The composite membrane according to claim 1 wherein the cation exchangers are selected from the group consisting of cation exchange resin particles, zeolite, and mixtures thereof.
Claim 5
Dependent Claim
16 words
The composite membrane according to claim 3 wherein the membrane is supported on a porous support.
Claim 6
Dependent Claim
21 words
The composite membrane according to claim 3 wherein the cation exchange capacity of the cation exchangers is at least 0.1 meq/g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |