Patent FR352638A successfully refreshed from Google Patents.
US4215918A
Expired / Lapsed
US
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Electrochromic display device
Assignee: University of Florida
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Filing: 1978-09-13
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Granted: 1980-08-05
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Expires: 1998-09-13
Abstract
Abstract An improved electrochromic display device in which a thin, optically transparent, electrically conductive layer or film is applied to the electrochromic layer surface which is oriented toward the electrolyte.
Inventors
- 👤 Derek B. Dove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:36
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
In a variable light transmission device comprising a layer of a persistent electrochromic material, said material having its optical absorption alterable by addition or removal of electrons, a layer of electrolyte, said electrolyte and said electrochromic material being between a pair of electrodes, and means for connecting said electrodes to electric source means, the combination of a transparent conductive film interposed between and in contact with said electrolyte and said electrochromic material layers and spaced from said electrodes, and means for connecting said transparent conductive film to said electric source means.
Claim 2
Dependent Claim
91 words
In a variable light transmission device comprising a layer of a persistent electrochromic material, said material having its optical absorption alterable by addition or removal of electrons, a layer of electrolyte, said electrolyte and said electrochromic material being between a pair of electrodes, and means for connecting said electrodes to electric source means, the combination of a transparent conductive film interposed between and in contact with said electrolyte and said electrochromic material layers and spaced from said electrodes, and means for connecting said transparent conductive film to said electric source means.
Claim 3
Dependent Claim
14 words
The combination according to claim 1 wherein said film is of a noble metal.
Claim 4
Dependent Claim
12 words
The combination according to claim 1 wherein said film is of gold.
Claim 5
Dependent Claim
29 words
The combination according to claim 1 wherein said electrochromic layer is of tungsten oxide, said electrolyte layer is a sulphuric acid-polyvinyl alcohol gel, and said film is of gold.
Claim 6
Independent Claim
91 words
The method of enhancing the response of a persistent electrochromic material layer to the application of voltages between a back electrode engaged with one face of such layer and a counter electrode in electrical contact in an electrolyte to which the opposite face of said layer is exposed which comprises applying a potential to a thin film of conductive material disposed at the interface between such electrochromic material layer and such electrolyte which is opposite in sign with respect to said back electrode to the potential applied to such counter electrode.
Claim 7
Independent Claim
91 words
The method of enhancing the response of a persistent electrochromic material layer to the application of voltages between a back electrode engaged with one face of such layer and a counter electrode in electrical contact in an electrolyte to which the opposite face of said layer is exposed which comprises applying a potential to a thin film of conductive material disposed at the interface between such electrochromic material layer and such electrolyte which is opposite in sign with respect to said back electrode to the potential applied to such counter electrode.
References Cited (Backward Citations)
US3708220A
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 |