US4183631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: Panasonic Holdings Corp
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Filing: 1978-01-04
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Granted: 1980-01-15
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Expires: 1998-01-04
Abstract
Abstract An electronic display device is described in which the counter-electrode is made of a layer of porous metal which is electrochemically irreversible as well as a display electrode and an electrolyte containing an electrochromic substance capable of reversibly displaying color together with a solution of metal ions of the porous metal counter electrode. The electrodes and electrolyte are contained within a cell in which, during operation, an electric double layer is formed on the surface of the porous metal counter-electrode.
Inventors
- 👤 Shigeo Kondo
- 👤 Nobuyuki Yoshiike
- 👤 Masakazu Fukai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:31
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; G02F1/1503; G02F1/161
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
In an electrochromic device comprising a display electrode, a counter-electrode and an electrolyte containing an electrochromic material capable of reversibly displaying color all contained within a cell, the improvement wherein said counter-electrode is made of porous metal which is electrochemically irreversible and wherein said electrolyte is an aqueous solution containing metal ions of said counter-electrode, whereby the electrochemical reaction on said counter-electrode is a charge-and-discharge reaction of an electric double layer formed on the surface of said counter-electrode.
Claim 2
Dependent Claim
78 words
In an electrochromic device comprising a display electrode, a counter-electrode and an electrolyte containing an electrochromic material capable of reversibly displaying color all contained within a cell, the improvement wherein said counter-electrode is made of porous metal which is electrochemically irreversible and wherein said electrolyte is an aqueous solution containing metal ions of said counter-electrode, whereby the electrochemical reaction on said counter-electrode is a charge-and-discharge reaction of an electric double layer formed on the surface of said counter-electrode.
Claim 3
Dependent Claim
23 words
An electrochromic device of claim 1, wherein said counter-electrode is a combination of a porous conductor and a metal sheet in contact therewith.
Claim 4
Dependent Claim
17 words
An electrochromic device of claim 1, wherein porosity of said porous conductor is between 65% and 95%.
Claim 5
Dependent Claim
17 words
An electrochromic device of claim 2, wherein porosity of said porous conductor is between 65% and 95%.
Claim 6
Dependent Claim
33 words
An electrochromic device of claim 1, wherein said porous conductor is a member selected from the group consisting of sintered powder metal, blown sintered powder metal and a pressed composition of metal powder.
Claim 7
Dependent Claim
14 words
The electrochromic device of claim 1, wherein said porous metal is nickel or gold.
Claim 8
Dependent Claim
14 words
An electrochromic device of claim 2, wherein said porous metal is nickel or gold.
Claim 9
Dependent Claim
12 words
An electrochromic device of claim 1, wherein said electrolyte contains nickel ions.
Claim 10
Dependent Claim
56 words
An electrochromic device of claim 1, wherein said electrochromic material is a 4,4'-dipyridinium salt having the composition ##STR3## wherein: R and R' are members selected from the group consisting of an alkyl group and a paracyano-phenyl group and X - electrochemically inactive monovalent anion selected from the group consisting of Br - and Cl - .
References Cited (Backward Citations)
US3978007A
Cited
US3854794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |