US3987781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Greenhouse window for solar heat absorbing systems derived from Cd2 SnO4
Assignee: Wyeth Holdings LLC
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Filing: 1975-05-27
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Granted: 1976-10-26
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Expires: 1995-05-27
Abstract
Abstract Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10 3 ohm.sup. -1 cm.sup. -1 , it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.
Inventors
- 👤 Arthur Jack Nozik
- 👤 Gottfried Haacke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:32
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C09; C09D; C09D5/00; C09D5/32; F; F24; F24S; F24S50/00; F24S50/80; F24S80/00; F24S80/50; F24S80/52; G; G02; G02B; G02B5/00; G02B5/20; G02B5/208; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2217/232; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/154; C03C2218/17; F24S23/00; F24S23/70; F24S2023/88; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A solar heat-absorbing system comprising a substrate having high transmittance for solar radiation which has deposited thereon a layer of cadmium stannate having high transmittance for solar radiation and high reflectance for thermal infrared radiation and positioned adjacent to said cadmium stannate layer a body having a high absorptivity for solar radiation, said body having heat transfer means attached thereto, whereby solar energy absorbed in said body is withdrawn therefrom as useful energy; said layer of cadmium stannate having been produced by spraying a solution containing cadmium and tin salts in a molar ratio of 2:1 onto the hot transparent substrate in the presence of an oxidizing agent.
Claim 2
Dependent Claim
108 words
A solar heat-absorbing system comprising a substrate having high transmittance for solar radiation which has deposited thereon a layer of cadmium stannate having high transmittance for solar radiation and high reflectance for thermal infrared radiation and positioned adjacent to said cadmium stannate layer a body having a high absorptivity for solar radiation, said body having heat transfer means attached thereto, whereby solar energy absorbed in said body is withdrawn therefrom as useful energy; said layer of cadmium stannate having been produced by spraying a solution containing cadmium and tin salts in a molar ratio of 2:1 onto the hot transparent substrate in the presence of an oxidizing agent.
Claim 3
Dependent Claim
24 words
The solar heat-absorbing system of claim 1 wherein the cadmium and tin salts are the respective bromides and the oxidizing agent is hydrogen peroxide.
Claim 4
Dependent Claim
19 words
The solar heat-absorbing system of claim 2 wherein the substrate temperature is maintained between 400° C. and 1000° C.
Claim 5
Dependent Claim
18 words
The solar heat-absorbing system of claim 2 wherein an oxygen rich gas is used as the atomizing gas.
References Cited (Backward Citations)
US1946184A
Cited
US3811953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |