Patent US3834793A successfully refreshed from Google Patents.
US3834793A
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US
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Dichromic mirror having multilayer thin films including vanadium dioxide
Assignee: ADVANCE TECHNOLOGY CENTER Inc
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Filing: 1973-06-21
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Granted: 1974-09-10
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Expires: 1993-06-21
Abstract
Abstract An optical effect device in the form of a multi-layer mirror, with at least one layer consisting of vanadium dioxide, and the layers being limited in thickness to about 2,000 Angstroms such that interference effects can provide essentially any desired color. Methods are disclosed for determining what two colors are achievable with a given mirror as the VO2 is carried through its transition temperature, and methods are disclosed for optimizing the contrast in reflectance between the mirror in its hot and cold states.
Inventors
- 👤 Connell L Mc
- 👤 J Trimmier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/286; G02B5/201; G02B5/22; G02B5/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
The temperature-dependent mirror as claimed in claim 1 and further including a thin, transparent dielectric film on top of the coating of vanadium dioxide.
Claim 2
Dependent Claim
28 words
The temperature-dependent mirror as claimed in claim 2 wherein the index of refraction of the dielectric film is appreciably different from the index of refraction of vanadium dioxide.
Claim 3
Dependent Claim
25 words
The temperature-dependent mirror as claimed in claim 2 wherein the dielectric film is selected from the group including silicon dioxide magnesium flouride, and aluminum oxide.
Claim 4
Dependent Claim
54 words
The temperature-dependent mirror as claimed in claim 1 wherein a transparent dielectric material is interposed between the vanadium dioxide and the substrate, and said dielectric material has a lower thermal conductivity than the vanadium dioxide, whereby the resolution of a recorded image in the vanadium dioxide in response to thermal stimuli will be enhanced.
Claim 5
Dependent Claim
37 words
The temperature-dependent mirror as claimed in claim 1 and further including a second thin layer of vanadium dioxide, with the layers of vanadium dioxide being separated from each other by a transparent layer of a dielectric material.
Claim 6
Dependent Claim
26 words
The temperature-dependent mirror as claimed in claim 6 wherein each of the vanadium dioxide films has a thickness in the range of about 150A to 2,000A.
References Cited (Backward Citations)
US3323241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |