Patent US5072789A successfully refreshed from Google Patents.
US5072789A
Expired / Lapsed
US
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Heat exchanger made of aluminum
Assignee: Altemira Co Ltd
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Filing: 1990-12-06
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Granted: 1991-12-17
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Expires: 2010-12-06
Abstract
Abstract A heat exchanger made of aluminum includes a tube and a fin joined thereto by a fillet which is made primarily of zinc. The tube and the fin are each prepared from a material made of aluminum and nobler than the fillet by at least 0.325 V in terms of potential. The use of the material for forming the tube and the fin prevents cracks from developing in the vicinity of the interface between the fillet and the tube or the fin.
Inventors
- 👤 Tadashi Usui
- 👤 Shinji Kagoshige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:09
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; F28F19/00; F28F19/004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A heat exchanger made of aluminum comprising a tube and a fin joined thereto by a fillet substantially made of zinc, each of the tube and the fin being prepared from a material made of aluminum and being nobler than the fillets by at least 0.325 V in terms of potential.
Claim 2
Dependent Claim
51 words
A heat exchanger made of aluminum comprising a tube and a fin joined thereto by a fillet substantially made of zinc, each of the tube and the fin being prepared from a material made of aluminum and being nobler than the fillets by at least 0.325 V in terms of potential.
Claim 3
Dependent Claim
36 words
A heat exchanger as defined in claim 1, wherein the tube and the fin are prepared from a material made of aluminum and nobler than the fillet by at least 0.375 V in terms of potential.
Claim 4
Dependent Claim
35 words
A heat exchanger as defined in claim 1, wherein the material made of aluminum is an aluminum alloy including between 0.1 and 1.0 wt. % of copper, and the balance being aluminum and inevitable impurities.
Claim 5
Dependent Claim
23 words
A heat exchanger as defined in claim 3, wherein the copper content of the aluminum alloy is between 0.2 and 0.5 wt %.
Claim 6
Dependent Claim
43 words
A heat exchanger as defined in claim 1, wherein the material made of aluminum is an aluminum alloy including between 0.1 and 1.0 wt. % of copper, between 0.1 and 1.0 wt. % of manganese, and the balance being aluminum and inevitable impurities.
Claim 7
Dependent Claim
23 words
A heat exchanger as defined in claim 5, wherein the copper content of the aluminum alloy is between 0.2 and 0.5 wt. %.
Claim 8
Dependent Claim
23 words
A heat exchanger as defined in claim 5, wherein the manganese content of the aluminum alloy is between 0.2 and 0.5 wt. %.
Claim 9
Dependent Claim
53 words
A heat exchanger as defined in claim 5, wherein the aluminum alloy further comprises at least one of titanium, boron, chromium and zirconium in an amount of between 0.01 and 0.1 wt. %, between 0.01 and 0.1 wt. %, between 0.01 and 0.5 wt. %, and between 0.01 and 0.5 wt. %, respectively.
Claim 10
Dependent Claim
20 words
A heat exchanger as defined in claim 1, wherein the fin and the tube are made of the same material.
References Cited (Backward Citations)
US4510030A
Cited
JPS6021176A
Cited
US4732311A
Cited
US4831701A
Cited
JPS61186164A
Cited
JPS61259871A
Cited
JPS6297767A
Cited
JPS62156071A
Cited
US4842185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |