US3973829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic devices with partially pre-charged counterelectrodes
Assignee: Wyeth Holdings LLC
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Filing: 1974-09-03
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Granted: 1976-08-10
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Expires: 1994-09-03
Abstract
Abstract An electrochromic data display and imaging device which may be formed by sandwich arrangement of the imaging area, the counter-electrode area with a suitable electrolyte layer between, the imaging area and/or counter-electrode area having greater uniformity of charge.
Inventors
- 👤 Robert Domenico Giglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, a counter-electrode, and an electrolyte material in contact with said light modulating material and said counter-electrode, wherein said counter-electrode includes electrochromic material in a substantially greater proportion than in said light modulating material and has a uniform predetermined partial electrical charge.
Claim 2
Dependent Claim
57 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, a counter-electrode, and an electrolyte material in contact with said light modulating material and said counter-electrode, wherein said counter-electrode includes electrochromic material in a substantially greater proportion than in said light modulating material and has a uniform predetermined partial electrical charge.
Claim 3
Dependent Claim
38 words
A variable light transmission device as in claim 1, which comprises three layers, one of electrochromic material, and the other of the counter-electrode separated by said electrolyte layer, said layers being disposed between a pair of conductive electrodes.
Claim 4
Dependent Claim
16 words
The device of claim 2, wherein said counter-electrode is the type of the persistent electrochromic material.
Claim 5
Dependent Claim
15 words
The device of claim 3, wherein the electrochromic materials in each said layer are identical.
Claim 6
Dependent Claim
15 words
The device of claim 3, wherein at least one of the electrodes is substantially transparent.
Claim 7
Dependent Claim
13 words
The device of claim 4, wherein said electrochromic materials are WO 3 .
Claim 8
Dependent Claim
13 words
A device as in claim 1, wherein said electrolyte contains a gelling agent.
Claim 9
Dependent Claim
42 words
The device of claim 6, wherein the relative charge on the layers is such that when the light modulating layer is in the uncharged state, the counter-electrode layer has from about 40 to 80% of the electrochromic material in the charged state.
References Cited (Backward Citations)
US3708220A
Cited
US3840287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |