Patent US4215917A successfully refreshed from Google Patents.
US4215917A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange-electrolyte layer for electrochromic devices
Assignee: Wyeth Holdings LLC
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Filing: 1976-10-27
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Granted: 1980-08-05
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Expires: 1996-10-27
Abstract
Abstract Disclosed is an electrochromic variable light modulating device including an improved ion conducting medium comprising a solid or semi-solid layer of polymer of the ion exchange type wetted with a small amount of water and/or acid electrolyte solution.
Inventors
- 👤 Robert D. Giglia
- 👤 Thomas B. Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
In an electrochromic variable light modulating device having an arrangement comprising a light transmitting substrate with a persistent electrochromic material as a light modulating material and a counter-electrode separated from said substrate by an ion conducting medium, an improved ion conducting medium comprising a polymeric ion exchange membrane layer wetted with an electrolyte solution.
Claim 2
Dependent Claim
54 words
In an electrochromic variable light modulating device having an arrangement comprising a light transmitting substrate with a persistent electrochromic material as a light modulating material and a counter-electrode separated from said substrate by an ion conducting medium, an improved ion conducting medium comprising a polymeric ion exchange membrane layer wetted with an electrolyte solution.
Claim 3
Dependent Claim
17 words
The electrochromic device of claim 1 wherein the ion exchange resin is wetted with an acid solution.
Claim 4
Dependent Claim
17 words
The electrochromic device of claim 2 wherein the electrolyte solution is a dilute solution of sulfuric acid.
Claim 5
Dependent Claim
18 words
The electrochromic device of claim 2 wherein said ion exchange resin is of the sulfonated polyphenylene oxide type.
Claim 6
Dependent Claim
17 words
The electrochromic device of claim 2 wherein said ion exchange resin is of the perfluorosulfonic acid type.
Claim 7
Dependent Claim
18 words
The elecrochromic device of claim 2 wherein said ion exchange resin is of the polystyrene sulfonic acid type.
Claim 8
Dependent Claim
17 words
The electrochromic device of claim 6 wherein said ion exchange resin is a perfluoro polystyrene sulfonic acid.
Claim 9
Dependent Claim
20 words
The electrochromic device of claim 2 wherein said ion exchange resin is of the fluorinated ethylene propylene sulfonic acid type.
Claim 10
Dependent Claim
17 words
The electrochromic device of claim 2 wherein said ion exchange resin is of the sulfonated polyethylene type.
Claim 11
Dependent Claim
25 words
The electrochromic device of claim 2 wherein the ion conducting medium includes a pigment to provide a color background contrast for the persistent electrochromic material.
Claim 12
Dependent Claim
68 words
A process of making an electrochromic variable light modulating device with an ion conducting medium as described in claim 1, comprising fashioning a layer of polymeric ion exchange material to a size and shape compatible with the light transmitting substrate and the counter-electrode, wetting said ion exchange material with an electrolyte solution, inserting the wetted ion exchange material in the electrochromic device between said substrate and said counter-electrode.
Claim 13
Dependent Claim
25 words
The process of claim 11 including adding a pigment to the ion conducting medium so as to offer a contrasting background for the electrochromic material.
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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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |