Patent US4011190A successfully refreshed from Google Patents.
US4011190A
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Selective black for absorption of solar energy
Assignee: Ses Inc
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Filing: 1975-11-24
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Granted: 1977-03-08
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Expires: 1995-11-24
Abstract
Abstract Improved selective black particles for use in solar receivers are described. The improved selective blacks comprise small particles of a metal having a low emissivity which are coated with a thin layer of an optically dark material having high absorptivity and low reflectivity for solar wavelengths and which is transparent for higher wavelengths in the thermal range. The improved selective black particles can be applied, e.g., as a paint, to any surface suitable for a solar heat receiver.
Inventors
- 👤 Maria Telkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:08
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/32; C09C; C09C1/00; C09C1/62; F; F24; F24S; F24S70/00; F24S70/20; F24S70/25; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
56 words
A black particle suitable for absorption of solar energy which comprises a reflective metal particle having an emissivity less than about 0.1 coated with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90, and a reflectivity of less than about 0.1.
Claim 2
Dependent Claim
56 words
A black particle suitable for absorption of solar energy which comprises a reflective metal particle having an emissivity less than about 0.1 coated with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90, and a reflectivity of less than about 0.1.
Claim 3
Dependent Claim
14 words
The particle according to claim 1 having a diameter less than about 10 microns.
Claim 4
Dependent Claim
16 words
The particle according to claim 2 wherein the film is less than about 1 micron thick.
Claim 5
Dependent Claim
11 words
The particle according to claim 1 wherein the metal is aluminum.
Claim 6
Dependent Claim
11 words
The particle according to claim 1 wherein the metal is zinc.
Claim 7
Dependent Claim
12 words
The particle according to claim 5 wherein the film is cupric oxide.
Claim 8
Dependent Claim
28 words
The particle according to claim 1 wherein the metal has an emissivity less than about 0.05 and the semiconductor material has an absorptivity of at least about 0.95.
Claim 9
Dependent Claim
24 words
The particle according to claim 1 having a diameter less than about 5 microns and the film is less than about 1 micron thick.
Claim 10
Dependent Claim
75 words
A black surface for absorption of solar energy comprising a substrate coated with black particles in a binder transparent to wavelengths longer than about three microns, said black particle being a reflective metal particle having an emissivity less than about 0.1 covered with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90 and a reflectivity of less than about 0.1.
Claim 11
Dependent Claim
75 words
A black surface for absorption of solar energy comprising a substrate coated with black particles in a binder transparent to wavelengths longer than about three microns, said black particle being a reflective metal particle having an emissivity less than about 0.1 covered with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90 and a reflectivity of less than about 0.1.
Claim 12
Dependent Claim
12 words
The black surface according to claim 9 wherein the substrate is aluminum.
Claim 13
Dependent Claim
12 words
The black surface according to claim 10 wherein the substrate is copper.
Claim 14
Dependent Claim
29 words
The black surface according to claim 9 wherein the metal particle has a diameter less than about 5 microns and the film is less than about 1 micron thick.
Claim 15
Dependent Claim
66 words
A paint comprising a solvent, a binder transparent to wavelengths longer than about 3 microns, and a pigment, said pigment being a reflective metal particle having an emissivity less than about 0.1 covered with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90 and a reflectivity of less than about 0.1.
Claim 16
Dependent Claim
66 words
A paint comprising a solvent, a binder transparent to wavelengths longer than about 3 microns, and a pigment, said pigment being a reflective metal particle having an emissivity less than about 0.1 covered with a thin film of a semiconductor material which transmits wavelengths longer than 2 microns and which has an absorptivity of at least about 0.90 and a reflectivity of less than about 0.1.
Claim 17
Dependent Claim
28 words
The paint according to claim 13 wherein the metal particle has a diameter less than about 5 microns and the film is less than about 1 micron thick.
Claim 18
Dependent Claim
12 words
The paint according to claim 14 wherein the metal particle is zinc.
Claim 19
Dependent Claim
12 words
The paint according to claim 14 wherein the metal particle is aluminum.
Claim 20
Dependent Claim
12 words
The paint according to claim 15 wherein the film is cupric oxide.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |