US3829196A
Expired / Lapsed
US
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Variable light transmission device
Assignee: Wyeth Holdings LLC
•
Filing: 1973-04-10
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Granted: 1974-08-13
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Expires: 1993-04-10
Abstract
Abstract Variable light transmission device typically comprising a transition metal oxide layer sandwiched between a pair of electrode layers such as stannic oxide-coated glass and gold film. When an electric field is applied across the electrodes the device exhibits persistent coloration at ambient temperature.
Inventors
- 👤 S Deb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
25 words
The device of claim 1 wherein said electrochromic material and said electrodes are relatively thin layers and said electrochromic material is sandwicheD between said electrodes.
Claim 2
Dependent Claim
15 words
The device of claim 2 wherein at least one of said electrodes is substantially transparent.
Claim 3
Dependent Claim
24 words
The device fo claim 1 wherein said electrochromic material layer is a film of thickness in the range of about 0.1 to 100 microns.
Claim 4
Dependent Claim
18 words
The device of claim 1 wherein said electrochromic material contains at least one element of variable oxidation state.
Claim 5
Dependent Claim
25 words
The device of claim 1 wherein said electrochromic material is tungsten oxide, molybdenum oxide, niobium oxide, vanadium oxide, copper molybdate, copper stannate, or cobalt tungstate.
Claim 6
Dependent Claim
14 words
The device of claim 6 wherein the electrochromic material is doped with a metal.
Claim 7
Dependent Claim
12 words
The device of claim 1 wherein said electrochromic material is tungsten oxide.
Claim 8
Dependent Claim
12 words
The device of claim 1 wherein said electrochromic material is molybdenum oxide.
Claim 9
Dependent Claim
14 words
The device of claim 1 wherein said electromagnetic radiation is in the visible spectrum.
Claim 10
Independent Claim
154 words
A device for providing variable absorption of electromagnetic radiation wherein said absorption may be varied from substantially no absorption to a desired degree of absorption and wherein said absorption may be reversed to said substantially non-absorptive state, further where said absorption may be fixed and be persistent at any point from the non-absorptive to the maximum absorptive state, which comprises a thin coherent layer of substantially only a solid, persistent electrochromic material, a pair of electrodes in contact with said material, and means for applying direct current voltage to said pair of electrodes to create an electric field across said material, said current being of a polarity which increases absorption, to increase absorption, for a time to obtain desired absorption, and then stopped, whereby said desired absorptive state persists; and means to apply a current of a reverse polarity for a time to obtain a desired decrease in absorption, when such decrease is desired.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |