US4721349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent heat-mirror
Assignee: Massachusetts Institute of Technology
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Filing: 1985-12-02
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Granted: 1988-01-26
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Expires: 2005-12-02
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
2026-11-03 18:14
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282; F; F24; F24S; F24S80/00; F24S80/50; F24S80/56; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A composite film comprising a continuous, discrete silver layer sandwiched between two continuous, discrete, transparent layers each having a thickness of greater than about 150 Å, said silver and transparent layers having thicknesses that cooperate to provide said composite film with significantly higher solar energy transmission compared to the silver layer alone and with high infrared reflectivity.
Claim 2
Dependent Claim
57 words
A composite film comprising a continuous, discrete silver layer sandwiched between two continuous, discrete, transparent layers each having a thickness of greater than about 150 Å, said silver and transparent layers having thicknesses that cooperate to provide said composite film with significantly higher solar energy transmission compared to the silver layer alone and with high infrared reflectivity.
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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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |