Patent US4556277A successfully refreshed from Google Patents.
US4556277A
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Transparent heat-mirror
Assignee: Massachusetts Institute of Technology
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Filing: 1982-04-05
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Granted: 1985-12-03
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Expires: 2002-04-05
Abstract
Abstract Transparent heat-mirrors are disclosed which are comprised of composite films. These films include a discrete and continuous layer of metallic silver sandwiched between a transparent, outer, protective, anti-reflection layer and a transparent, phase-matching layer. This combination of layers is chosen to provide high solar transmission with minimum loss of thermal radiation. Transparent heat-mirrors are useful in the collection and trapping of solar energy, and in other applications where it is desired or necessary to have high infrared reflectivity with high solar transmission.
Inventors
- 👤 John C. C. Fan
- 👤 Frank J. Bachner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282; F; F24; F24S; F24S80/00; F24S80/50; F24S80/52; F24S80/56; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A composite film comprising a continuous, discrete, silver layer sandwiched between two continuous and discrete layers of titanium dioxide each having a thickness of greater than about 150 Å, said silver and titanium dioxide layers having thicknesses that cooperate to provide said composite film with significantly higher solar energy transmission compared to said silver layer alone and having high infrared reflectively.
Claim 2
Dependent Claim
61 words
A composite film comprising a continuous, discrete, silver layer sandwiched between two continuous and discrete layers of titanium dioxide each having a thickness of greater than about 150 Å, said silver and titanium dioxide layers having thicknesses that cooperate to provide said composite film with significantly higher solar energy transmission compared to said silver layer alone and having high infrared reflectively.
Claim 3
Dependent Claim
28 words
A composite film of claim 1 wherein each of said titanium dioxide layers has a thickness within the range of from about 150 Å to about 500 Å.
Claim 4
Dependent Claim
27 words
The composite film of claim 1 or 2 wherein said silver layer has a thickness within the range of from about 30 Å to about 200 Å.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |