US3704057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic device having identical display and counter electrode materials
Assignee: Wyeth Holdings LLC
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Filing: 1971-06-02
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Granted: 1972-11-28
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Expires: 1991-06-02
Abstract
Abstract An electro-optical device is provided which is useful in control of visible and infrared absorption by windows, data display devices and the like typically comprising an electrochromic material as the display area, the same type of electrochromic material serving as an electrode for the device.
Inventors
- 👤 Lindley Clair Beegie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; G02F1/1524
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A variable light transmission device comprising a layer of a persistent electrochromic material, a counter electrode comprising the same persistent electrochromic material as said layer, a semi-solid electrolyte in contact with both said layer and said counter electrode, means to form separate electrical contact with each of said layer and said counter electrode, and means to contain said layer, counter electrode and electrolyte, said means having at least a portion that is light transmitting.
Claim 2
Dependent Claim
74 words
A variable light transmission device comprising a layer of a persistent electrochromic material, a counter electrode comprising the same persistent electrochromic material as said layer, a semi-solid electrolyte in contact with both said layer and said counter electrode, means to form separate electrical contact with each of said layer and said counter electrode, and means to contain said layer, counter electrode and electrolyte, said means having at least a portion that is light transmitting.
Claim 3
Dependent Claim
37 words
A variable light transmission device, as in claim 1, which comprises at least two layers of a persistent electrochromic material formed from the same original deposit, wherein one of said layers is used as the counter electrode.
Claim 4
Dependent Claim
15 words
The device of claim 1 wherein the semi-solid electrolyte is a sulfuric acid-polyvinyl alcohol gel.
Claim 5
Dependent Claim
19 words
The device of claim 3 wherein the gel electrolyte has a conductance of at least that of 4M H2SO4.
Claim 6
Dependent Claim
25 words
The device of claim 2 wherein the semi-solid electrolyte is in face to face electrical contact with two separate but identical films of tungsten oxide.
Claim 7
Dependent Claim
15 words
the device of claim 2 wherein at least one of the electrodes is substantially transparent.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |