US4267218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar collector with blackened layer facing insulation
Assignee: Langbein Pfanhauser Werke AG
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Filing: 1979-04-11
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Granted: 1981-05-12
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Expires: 1999-04-11
Abstract
Abstract A solar collector has a surface turned toward the sun and forms a heat exchange cell which has at least one wall composed of sheet aluminum. A tramsmitting layer of such a wall or the absorption layer thereof is a black layer of aluminum oxide containing Ag or Sn and formed unitarily on the aluminum sheet, e.g. by a chemical or electrochemical process.
Inventors
- 👤 Robert Brugger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:02
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20; C25D11/22; F; F24; F24S; F24S10/00; F24S10/50; F24S70/00; F24S70/20; F24S70/25; F24S70/60; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y10; Y10S; Y10S205/00; Y10S205/923; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/13
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A solar energy collector comprising: a housing; a heat exchange cell formed in said housing and traversible by a heat exchange medium to carry away collected thermal energy; a heat-insulating chamber in said housing adjoining said cell along side thereof turned toward solar energy incident upon the collector; and a body of insulating material in said housing along the side of said cell, said cell having a first wall separating it from said chamber and a second wall separating it from said body, each of said walls being constituted of an aluminum sheet, the sheet of said first wall being provided with black metal-containing aluminum oxide layers on both of its sides to form energy transmitter layers and the sheet of said second wall being formed with a black metal-containing aluminum oxide layer on its side turned toward said body of insulation and constituting an energy absorber layer, each of said black aluminum oxide layers containing a metal other than aluminum and selected from the group which consists of tin or silver.
Claim 2
Dependent Claim
172 words
A solar energy collector comprising: a housing; a heat exchange cell formed in said housing and traversible by a heat exchange medium to carry away collected thermal energy; a heat-insulating chamber in said housing adjoining said cell along side thereof turned toward solar energy incident upon the collector; and a body of insulating material in said housing along the side of said cell, said cell having a first wall separating it from said chamber and a second wall separating it from said body, each of said walls being constituted of an aluminum sheet, the sheet of said first wall being provided with black metal-containing aluminum oxide layers on both of its sides to form energy transmitter layers and the sheet of said second wall being formed with a black metal-containing aluminum oxide layer on its side turned toward said body of insulation and constituting an energy absorber layer, each of said black aluminum oxide layers containing a metal other than aluminum and selected from the group which consists of tin or silver.
Claim 3
Dependent Claim
33 words
The collector defined in claim 1 wherein a black aluminum oxide layer is formed on said second wall only, along the side thereof turned toward and in contact with said body of insulation.
Claim 4
Dependent Claim
37 words
The collector defined in claim 2 wherein said chamber is formed along the side thereof turned toward the sun with an aluminum sheet cover having its side face the sun provided with a black aluminum oxide layer.
Claim 5
Dependent Claim
75 words
The collector defined in claim 1, claim 2 or claim 3 wherein at least one of said layers is formed by the steps of: (a) caustic pickling of an aluminum sheet substrate in a sodium hydroxide solution; (b) acid treatment following step (a) in nitric acid; (c) anodization following step (b) by direct current in a sulphuric acid solution; and (d) electrolytic coloring following step (c) in the presence of a tin or silver compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |