US4170406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic devices having protective interlayers
Assignee: Wyeth Holdings LLC
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Filing: 1977-11-14
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Granted: 1979-10-09
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Expires: 1997-11-14
Abstract
Abstract The incorporation of a non-electrochromic layer between the electrochromic material and the electrolyte in an electrochromic device produces longer lasting, more uniform devices.
Inventors
- 👤 Robert D. Giglia
- 👤 Richard H. Clasen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:32
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; G02F1/1524
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
An electrochromic device comprising an electrode having an electrically conductive surface, a layer of persistent electrochromic compound in contact on one of its sides with said conductive surface of said electrode, and on its opposite side with a layer of a non-electrochromic compound having the same composition as said electrochromic compound except being more highly oxidized hence non-electrochromic, said non-electrochromic layer being in contact on its opposite side with a current carrier permeable insulator layer which on its opposite side is in contact with a counter electrode layer and means for selectively applying electrical fields of opposite polarity across said electrodes.
Claim 2
Dependent Claim
101 words
An electrochromic device comprising an electrode having an electrically conductive surface, a layer of persistent electrochromic compound in contact on one of its sides with said conductive surface of said electrode, and on its opposite side with a layer of a non-electrochromic compound having the same composition as said electrochromic compound except being more highly oxidized hence non-electrochromic, said non-electrochromic layer being in contact on its opposite side with a current carrier permeable insulator layer which on its opposite side is in contact with a counter electrode layer and means for selectively applying electrical fields of opposite polarity across said electrodes.
Claim 3
Dependent Claim
26 words
The device of claim 1 wherein the defined electrochromic compound is tungsten oxide and said non-electrochromic compound is a tungsten oxide in a higher oxidation state.
Claim 4
Dependent Claim
25 words
The device of claim 1 wherein the current carrier insulator layer is selected from the group consisting of silicon oxide, calcium fluoride and magnesium fluoride.
Claim 5
Dependent Claim
14 words
The device of claim 1 wherein the current carrier insulator layer is silicon oxide.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |