US4201454A
Expired / Lapsed
US
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Heat treated electrochromic devices
Assignee: AT&T Inc
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Filing: 1978-06-27
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Granted: 1980-05-06
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Expires: 1998-06-27
Abstract
Abstract Electrochromic devices based on anodic iridium oxide as the electrochromic material have been made. These devices exhibit long term stability, memory, and good response times, e.g., less than 80 msec. for reflectivity changes of about 70% (50 msec. for 50% changes). Devices using an anodic iridium oxide film immersed in a sulfate electrolyte have been operated for more than 6×10 5 coloration/bleaching cycles at 0.5 Hz without noticeable change in properties. Response times and stability are also improved by a heat treatment of the anodic iridium oxide at temperatures between 40 and 100 degrees C.
Inventors
- 👤 Gerardo Beni
- 👤 Joseph L. Shay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; G02F1/1524; G02F1/15245
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
An electrochromic device comprising a first electrode and a second electrode contacted with an electrolyte CHARACTERIZED IN THAT said first electrode contains anodic iridium oxide, which has been heat treated at a temperature in the range from 40 to 100 degrees C.
Claim 2
Dependent Claim
42 words
An electrochromic device comprising a first electrode and a second electrode contacted with an electrolyte CHARACTERIZED IN THAT said first electrode contains anodic iridium oxide, which has been heat treated at a temperature in the range from 40 to 100 degrees C.
Claim 3
Dependent Claim
21 words
The electrochromic device of claim 1 wherein said heat treatment is done while said iridium oxide is in a colored state.
Claim 4
Dependent Claim
20 words
The electrochromic device of claim 1 wherein the pH of said electrolyte is in the range of 2 to 12.
Claim 5
Dependent Claim
22 words
The electrochromic device of claim 3 wherein the conductivity of said electrolyte is greater than 0.01 ohm -1 and cm -1 .
Claim 6
Dependent Claim
15 words
The electrochromic device of claim 4 wherein said electrolyte is an aqueous lithium nitrate solution.
Claim 7
Dependent Claim
12 words
The electrochromic device of claim 4 wherein said electrolyte contains sulfate ions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |