US4414090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator membranes for redox-type electrochemical cells
Assignee: Rai Research Corp
•
Filing: 1981-10-01
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Granted: 1983-11-08
•
Expires: 2001-10-01
Abstract
Abstract This disclosure is directed to improved redox type electrochemical cells, preferably those of the iron (+3)/iron (+2) electrolyte variety, incorporating polymeric, ion-exchange separator membranes produced by radiation grafting techniques.
Inventors
- 👤 Vincent F. D'Agostino
- 👤 Joseph Y. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:59
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J2339/00; C08J2339/04; C08J2339/08; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
In an improved redox electrochemical cell incorporating two chemically-inert electrodes of opposite polarity, at least one aqueous acidic electrolyte, and a separator membrane between the adjacent electrodes, the improvement comprising a separator membrane formed from a polyolefin film grafted with a vinyl-substituted monomer via gamma irradiation.
Claim 2
Dependent Claim
46 words
In an improved redox electrochemical cell incorporating two chemically-inert electrodes of opposite polarity, at least one aqueous acidic electrolyte, and a separator membrane between the adjacent electrodes, the improvement comprising a separator membrane formed from a polyolefin film grafted with a vinyl-substituted monomer via gamma irradiation.
Claim 3
Dependent Claim
32 words
The redox cell of claim 1 in which the polyolefin film is selected from the group comprising polypropylene, high density polyethylene, low density polyethylene, a perfluorinated polyolefin or a partially fluorinated polyolefin.
Claim 4
Dependent Claim
12 words
The redox cell of claim 1 which the vinyl-substituted monomer is 4-vinylpyridine.
Claim 5
Dependent Claim
13 words
The redox cell of claim 1 in which the vinyl-substituted monomer is 2-vinylpyridine.
Claim 6
Dependent Claim
14 words
The redox cell of claim 1 in which the vinyl-substituted monomer is 2-vinylbenzyl chloride.
Claim 7
Dependent Claim
14 words
The redox cell of claim 1 in which the vinyl-substituted monomer is 4-vinylbenzyl chloride.
Claim 8
Dependent Claim
14 words
The redox cell of claim 1 in which the vinyl-substituted monomer is methacrylic acid.
Claim 9
Dependent Claim
13 words
The redox cell of claim 1 which the vinyl-substituted monomer is acrylic acid.
Claim 10
Dependent Claim
24 words
The redox cell of claim 1 in which the separator membrane is formed by grafting polypropylene with 4-vinylpyridine to 10-100% of the membrane weight.
Claim 11
Dependent Claim
26 words
The redox cell of claim 1 in which the separator membrane is formed by grafting high density polyethylene with 4-vinylpyridine to 29-146% of the membrane weight.
Claim 12
Dependent Claim
26 words
The redox cell of claim 1 in which the separator membrane is formed by grafting low density polyethylene to 4-vinylpyridine to 28-114% of the membrane weight.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |