US4211210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature solar absorber coating and method of applying same
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1978-03-01
•
Granted: 1980-07-08
•
Expires: 1998-03-01
Abstract
Abstract Improved coatings for high temperature solar collectors comprise thermally stable inorganic oxides selected from ferrites, metal oxides and mixtures thereof having solar absorptances greater than 0.9 at wavelengths ranging from about 0.35 to 3.0 microns. The coatings can be applied to a heat transfer surface by painting an organic silicate dispersion of the optically active material onto the substrate and thereafter curing the silicate binder.
Inventors
- 👤 Adolf H. Muenker
- 👤 II Archie R. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/32; C04; C04B; C04B35/00; C04B35/01; C04B35/26; F; F24; F24S; F24S20/00; F24S20/20; F24S70/00; F24S70/20; F24S70/225; F24S70/25; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
96 words
In a solar energy collector system of the type operable at temperatures above about 550° F. including a heat transfer member and wherein means are provided for concentrating incident solar radiation by a factor of from about 40 to 2000 to impinge on said heat transfer member, the improvement comprising a nonselective radiation absorbing surface coating on said heat transfer member, said surface coating being selected from ferrites, oxides of nickel, cobalt, iron, strontium and molybdenum and mixtures thereof having a solar absorptance greater than about 0.90 at wavelengths of from about 0.35μ to about 3.0μ.
Claim 2
Dependent Claim
96 words
In a solar energy collector system of the type operable at temperatures above about 550° F. including a heat transfer member and wherein means are provided for concentrating incident solar radiation by a factor of from about 40 to 2000 to impinge on said heat transfer member, the improvement comprising a nonselective radiation absorbing surface coating on said heat transfer member, said surface coating being selected from ferrites, oxides of nickel, cobalt, iron, strontium and molybdenum and mixtures thereof having a solar absorptance greater than about 0.90 at wavelengths of from about 0.35μ to about 3.0μ.
Claim 3
Dependent Claim
14 words
The solar collector system of claim 1 wherein the inorganic oxide is a ferrite.
Claim 4
Dependent Claim
44 words
The solar collector system of claim 2 wherein said ferrite has a crystal lattice in which from 1 to 4 different metals are included and said metals are selected from nickel, zinc, lithium, molybdenum, manganese, magnesium, cobalt, copper, strontium, barium, aluminum, gadolinium and yttrium.
Claim 5
Dependent Claim
14 words
The solar collector system of claim 2 wherein the ferrite is a nickel-zinc ferrite.
Claim 6
Dependent Claim
14 words
The solar collector system of claimm 2 wherein the ferrite is a lithium-zinc ferrite.
Claim 7
Dependent Claim
16 words
The solar collector system of claim 1 wherein the inorganic oxide is an oxide of cobalt.
Claim 8
Dependent Claim
16 words
The solar collector system of claim 1 wherein the inorganic oxide is an oxide of iron.
Claim 9
Dependent Claim
16 words
The solar collector system of claim 1 wherein the inorganic oxide is an oxide of molybdenum.
Claim 10
Dependent Claim
104 words
In a solar collector system of the type having light reflector means for concentrating incident solar radiation so as to impinge on a heat transfer member whereby the incident solar radiation is concentrated by a factor of from about 40 to 2000, the improvement comprising: an inorganic oxide coating on said heat transfer member, said coating having an absorptance greater than about 0.90, at wavelengths from about 0.35 to about 3.0μ and an emittance greater than 0.45 at wavelengths greater than 3.0μ, said inorganic oxide being selected from the group consisting of ferrites, oxides of nickel, cobalt, iron, molybdenum and strontium and mixtures thereof.
Claim 11
Dependent Claim
104 words
In a solar collector system of the type having light reflector means for concentrating incident solar radiation so as to impinge on a heat transfer member whereby the incident solar radiation is concentrated by a factor of from about 40 to 2000, the improvement comprising: an inorganic oxide coating on said heat transfer member, said coating having an absorptance greater than about 0.90, at wavelengths from about 0.35 to about 3.0μ and an emittance greater than 0.45 at wavelengths greater than 3.0μ, said inorganic oxide being selected from the group consisting of ferrites, oxides of nickel, cobalt, iron, molybdenum and strontium and mixtures thereof.
Claim 12
Dependent Claim
14 words
The improvement of claim 9 wherein the metal oxide is an oxide of cobalt.
Claim 13
Dependent Claim
43 words
The improvement of claim 9 wherein the inorganic oxide is a ferrite having from 1 to 4 different metals in the crystal lattice and said metals being selected from nickel, zinc, lithium, molybdenum, manganese, magnesium, cobalt, copper, barium, strontium, aluminum, gadolinium, and yttrium.
Claim 14
Dependent Claim
12 words
The improvement of claim 11 wherein the ferrite is a nickel-zinc ferrite.
Claim 15
Dependent Claim
19 words
The improvement of claim 11 wherein the nickel-zinc ferrite has the composition Ni.sub..35 Zn.sub..65 Fe 2 O 4 .
Claim 16
Dependent Claim
12 words
The improvement of claim 11 wherein the ferrite is a lithium-zinc ferrite.
Claim 17
Dependent Claim
20 words
The improvement of claim 14 wherein the lithium-zinc ferrite has the composition (Li.sub..5 Fe.sub..5)d .9Zn.sub..1 Fe 2 O 4 .
Claim 18
Dependent Claim
20 words
The improvement of claim 9 wherein the ferrite has the composition (Li.sub..5 Fe.sub..5).sub..45 Ni.sub..175 Zn.sub..375 Fe 2 O 4 .
Claim 19
Dependent Claim
16 words
The improvement of claim 11 wherein the ferrite has the composition 2CoO·BaO·8Fe 2 O 3 .
References Cited (Backward Citations)
US3978272A
Cited
US3951128A
Cited
US3952725A
Cited
US3958554A
Cited
US4082413A
Cited
US4082907A
Cited
US4097311A
Cited
US4011190A
Cited
US4055707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |