US4091793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar collector
Assignee: US Philips Corp
•
Filing: 1976-04-21
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Granted: 1978-05-30
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Expires: 1996-04-21
Abstract
Abstract A solar collector comprising an absorber and a heat-insulating transparent cover which consists of a number of sealed and evacuated glass tubes adjacently arranged in contact with each other, at least the lower half of the inner surface of each glass tube being provided with an infrared-reflecting layer.
Inventors
- 👤 Wilhelm Hermann
- 👤 Horst Horster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:20
CPC Classifications
F; F24; F24S; F24S80/00; F24S80/50; F24S80/54; F24S10/00; F24S10/70; F24S10/75; F24S80/56; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y02P; Y02P80/00; Y02P80/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A solar collector comprising an absorber for transferring heat from incident solar radiation to a transport medium, and a heat-insulating transparent cover separating the absorber from the ambient atmosphere and consisting of a plurality of sealed and evacuated glass tubes adjacently arranged in contact with each other, at least the lower half of the inner surface of each glass tube being provided with an infrared-reflecting layer, the inner surface of each glass tube also being provided on the infrared-reflecting layer with a reflection-reducing layer satisfying the condition n·d = λ/4, wherein n = the refractive index of the reflection-reducing layer; d = the thickness of the reflection-reducing layer; and
Claim 2
Dependent Claim
109 words
A solar collector comprising an absorber for transferring heat from incident solar radiation to a transport medium, and a heat-insulating transparent cover separating the absorber from the ambient atmosphere and consisting of a plurality of sealed and evacuated glass tubes adjacently arranged in contact with each other, at least the lower half of the inner surface of each glass tube being provided with an infrared-reflecting layer, the inner surface of each glass tube also being provided on the infrared-reflecting layer with a reflection-reducing layer satisfying the condition n·d = λ/4, wherein n = the refractive index of the reflection-reducing layer; d = the thickness of the reflection-reducing layer; and
Claim 3
Dependent Claim
4 words
λ= 0. 6 micron.
Claim 4
Dependent Claim
4 words
λ= 0. 6 micron.
Claim 5
Dependent Claim
23 words
A solar collector according to claim 1, in which the reflection-reducing layer is made of cryolite, magnesium fluoride or an oxide of silicon.
Claim 6
Dependent Claim
24 words
A solar collector according to claim 1, in which the outer surface of each glass tube is covered by a transparent layer of enamel.
Claim 7
Dependent Claim
25 words
A solar collector according to claim 1, which includes a convection-reducing foil extending from the junction of each pair of glass tubes to the absorber.
References Cited (Backward Citations)
US1801710A
Cited
US3957029A
Cited
US3981294A
Cited
US3974822A
Cited
US3978272A
Cited
US3981293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |