US4256379A
Expired / Lapsed
US
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Electrochromic device
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-01-22
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Granted: 1981-03-17
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Expires: 1999-01-22
Abstract
Abstract An electrochromic device in the form of a cell comprising a metal-sensitive compound having a thickness of 1 micrometer or less, preferable between 0.5 and 0.05 of a micrometer, is described in contact with a solid fast ion conductor as electrolyte. The fast ion conductor itself is in contact with an electrode capable of providing ions the same as the fast ions of the conductor.
Inventors
- 👤 Mino Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:35
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; G02F1/1524
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
An electrochromic device comprising a first electrode, a layer of a metal-sensitive compound in contact with the first electrode and in contact with a solid fast ion conductor in which fast ion conductor the fast ion is an ion of a metal which dissolves in the metal sensitive compound to change the colour thereof, the fast ion conductor itself being in contact with a second electrode capable of providing ions the same as the fast ions of the conductor, said layer of metal sensitive compound having a thickness of 1 micrometer or less.
Claim 2
Dependent Claim
93 words
An electrochromic device comprising a first electrode, a layer of a metal-sensitive compound in contact with the first electrode and in contact with a solid fast ion conductor in which fast ion conductor the fast ion is an ion of a metal which dissolves in the metal sensitive compound to change the colour thereof, the fast ion conductor itself being in contact with a second electrode capable of providing ions the same as the fast ions of the conductor, said layer of metal sensitive compound having a thickness of 1 micrometer or less.
Claim 3
Dependent Claim
19 words
A device according to claim 1 in which the metal sensitive compound is an oxide of a transitional metal.
Claim 4
Dependent Claim
22 words
A device according to claim 2 in which the transition metal is selected from the group consisting of tungsten, molybdenum and vanadium.
Claim 5
Dependent Claim
29 words
A device according to claim 1 in which the fast ion of the fast ion conductor is selected from the group consisting of alkali metal, copper and silver ions.
Claim 6
Dependent Claim
20 words
A device according to claim 1 in which the fast ion conductor has a resistivity less than 1×10 6 ohm-cm.
Claim 7
Dependent Claim
24 words
A device according to claim 1 in which the fast ion conductor is a complex silver halide with alkali metal or quaternary ammonium ions.
Claim 8
Dependent Claim
16 words
A device according to claim 6 in which the fast ion conductor is a complex iodide.
Claim 9
Dependent Claim
16 words
A device according to claim 7 in which the fast ion conductor is rubidium silver pentaiodide.
Claim 10
Dependent Claim
15 words
A device according to claim 1 in which the fast ion conductor is an alumina.
Claim 11
Dependent Claim
21 words
A device according to claim 9 in which the alumina is selected from the group selected from lithium-β-alumina, sodium-β-alumina and potassium-β-alumina.
Claim 12
Dependent Claim
18 words
A device according to claim 1 in which the second electrode is a tungsten bronze or a ferrite.
References Cited (Backward Citations)
US3973829A
Cited
US4060311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |