US3879108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic devices
Assignee: Wyeth Holdings LLC
•
Filing: 1973-05-18
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Granted: 1975-04-22
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Expires: 1993-05-18
Abstract
Abstract An electro-optical device useful in data display and imaging device typically comprising in sandwiched arrangement a pair of electrodes between which are disposed two similar electrochromic layers separated by a semi-solid conductive medium. The device exhibits superior electrochromic reversibility and greatly improved cell life over prolonged coloration and bleaching cycles.
Inventors
- 👤 Donald Joseph Berets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
Claim 2
Dependent Claim
38 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
Claim 3
Dependent Claim
38 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
Claim 4
Dependent Claim
38 words
A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
Claim 5
Dependent Claim
29 words
A variable light transmission device as in claim 1, which comprises two layers of electrochromic material separated by a semisolid conducting interlayer disposed between a pair of conductive electrodes.
Claim 6
Dependent Claim
15 words
The device of claim 2 wherein the electrochromic layers are composed of the same material.
Claim 7
Dependent Claim
15 words
The device of claim 2 wherein at least one of the electrodes is substantially transparent.
Claim 8
Dependent Claim
20 words
The device of claim 1 wherein at least one of the electrochromic materials is deposited in form of a grid.
Claim 9
Dependent Claim
22 words
The device of claim 4 wherein at least one of the electrochromic materials is deposited in the frame of the transparent electrode.
Claim 10
Dependent Claim
13 words
The device of claim 2 wherein an electrolytically conducting semisolid layer is employed.
Claim 11
Dependent Claim
30 words
A process which comprises subjecting the device of claim 1 to an electric field of alternating polarity whereby coloration and bleach cycles are obtained without change in voltage time characteristics.
References Cited (Backward Citations)
US3704057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |