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 03:08
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.
References Cited (Backward Citations)
US2527300A
Cited
US3419431A
Cited
US3341366A
Cited
US3453038A
Cited
US3528858A
Cited
US3684747A
Cited
US3708220A
Cited
US3704057A
Cited
US3827784A
Cited
US3819252A
Cited
US3840288A
Cited
US3970365A
Cited
US3971624A
Cited
DE2603200A1
Cited
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 |