Patent US3955879A successfully refreshed from Google Patents.
US3955879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear electrochromic device
Assignee: Optel Corp
•
Filing: 1973-10-25
•
Granted: 1976-05-11
•
Expires: 1993-10-25
Abstract
Abstract An electrochromic device comprises, in a layered structure, a first electrode, an electrochromic material, an electrolyte and a back electrode which is of a material different than said first electrode. The device is characterized as having a nonlinear voltage response, a well defined threshhold, and an internal electromotive force which is uniquely determined by the color state of the device.
Inventors
- 👤 Horst Witzke
- 👤 Matthew D. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:42
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
An electrochromic device comprising a transparent conductive first electrode selected from the group consisting of tin oxide and indium oxide, a film of an electrochromic oxide on said electrode, an acidic electrolyte layer which is not reactive with said electrochromic film over said electrochromic film, and a lead electrode over said electrolyte layer, said device having an internal EMF which is measured by the color state of the electrochromic layer.
Claim 2
Dependent Claim
70 words
An electrochromic device comprising a transparent conductive first electrode selected from the group consisting of tin oxide and indium oxide, a film of an electrochromic oxide on said electrode, an acidic electrolyte layer which is not reactive with said electrochromic film over said electrochromic film, and a lead electrode over said electrolyte layer, said device having an internal EMF which is measured by the color state of the electrochromic layer.
Claim 3
Dependent Claim
21 words
The device recited in claim 1 wherein said electrochromic oxide is tungsten oxide and wherein said acidic electrolyte is sulfuric acid.
Claim 4
Dependent Claim
18 words
The device recited in claim 2 wherein said sulfuric acid is in a concentration of about 4 molar.
References Cited (Backward Citations)
US3521941A
Cited
US3708220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |