Patent US4023557A successfully refreshed from Google Patents.
US4023557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar collector utilizing copper lined aluminum tubing and method of making such tubing
Assignee: Bank of Nova Scotia
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Filing: 1975-11-05
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Granted: 1977-05-17
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Expires: 1995-11-05
Abstract
Abstract Low cost solar collector panel utilizes surface mounted tubing in which the inner wall portion of the tubing is copper to permit the use of untreated water in the system. The outer wall portion of the tubing is aluminum which provides additional strength and is easily attached to a low cost aluminum absorber plate. A method of producing the composite aluminum-copper tubing in long length coils is disclosed. The tubing can also be formed into connectors for connecting copper and aluminum tubing together.
Inventors
- 👤 John K. Thorne
- 👤 Gary L. Province
- 👤 Clyde W. Siltanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
B; B21; B21C; B21C1/00; B21C1/16; B21C1/22; F; F24; F24S; F24S10/00; F24S10/70; F24S10/75; F24S10/755; F24S80/00; F24S80/10; F24S80/30; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
In a solar collector panel of the type including a generally flat aluminum plate absorber member having tubing bonded to it for carrying a heat transfer fluid to and from the panel, the improvement wherein said tubing is a composite comprising an inner copper tube bonded to an outer aluminum tube, said tubing having a wall thickness comprising no greater than 50% copper with the wall thickness of the copper portion being no greater than about 0.020 in.
Claim 2
Dependent Claim
78 words
In a solar collector panel of the type including a generally flat aluminum plate absorber member having tubing bonded to it for carrying a heat transfer fluid to and from the panel, the improvement wherein said tubing is a composite comprising an inner copper tube bonded to an outer aluminum tube, said tubing having a wall thickness comprising no greater than 50% copper with the wall thickness of the copper portion being no greater than about 0.020 in.
References Cited (Backward Citations)
US1799991A
Cited
US2060034A
Cited
US2316191A
Cited
US2947069A
Cited
US3267563A
Cited
US3957030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |