Patent US4416516A successfully refreshed from Google Patents.
US4416516A
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Matrix addressable electrochromic devices
Assignee: AT&T Inc
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Filing: 1981-04-14
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Granted: 1983-11-22
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Expires: 2001-04-14
Abstract
Abstract Electrochromic devices utilizing an electrochromic iridium oxide electrode and a tantalum oxide counterelectrode exhibit a voltage threshold and short circuit memory. The short circuit memory and voltage threshold allow the use of these devices in matrix addressing schemes.
Inventors
- 👤 Gerardo Beni
- 👤 Lawrence M. Schiavone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524; G02F1/15245; G02F1/163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A display comprising a plurality of elements and means for selectively changing the optical properties of said elements wherein said elements comprise an electrochromic electrode, an electrolyte, and a counterelectrode wherein a surface of a region of said electrochromic electrode and a surface of a region of said counterelectrode contact said electrolyte characterized in that said electrochromic electrode comprises electrochromic iridium oxide and said surface of said region of said counterelectrode contacting said electrolyte is essentially devoid of compositions other than tantalum oxide and high resistivity materials.
Claim 2
Dependent Claim
87 words
A display comprising a plurality of elements and means for selectively changing the optical properties of said elements wherein said elements comprise an electrochromic electrode, an electrolyte, and a counterelectrode wherein a surface of a region of said electrochromic electrode and a surface of a region of said counterelectrode contact said electrolyte characterized in that said electrochromic electrode comprises electrochromic iridium oxide and said surface of said region of said counterelectrode contacting said electrolyte is essentially devoid of compositions other than tantalum oxide and high resistivity materials.
Claim 3
Dependent Claim
16 words
The display of claim 1 wherein said tantalum oxide comprises the surface of a tantalum substrate.
Claim 4
Dependent Claim
18 words
The display of either claim 1 or 2 wherein said electrolyte comprises an aqueous solution of sulfuric acid.
Claim 5
Dependent Claim
19 words
The display of either claim 1 or 2 wherein said electrolyte comprises an aqueous Na 2 SO 4 solution.
Claim 6
Dependent Claim
16 words
The display of claim 1 wherein said electrochromic electrode is formed by a vacuum deposition technique.
Claim 7
Dependent Claim
16 words
The display of claim 1 wherein said electrochromic electrode is formed by a cyclic anodization technique.
Claim 8
Dependent Claim
23 words
The display of claim 1 wherein said means for changing the optical properties comprise electrical contacts to said electrochromic electrode and said counterelectrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |