US4781888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum brazing material for use in aluminum heat exchanger
Assignee: Sumitomo Precision Products Co Ltd
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Filing: 1985-04-05
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Granted: 1988-11-01
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Expires: 2005-04-05
Abstract
Abstract Aluminum brazing alloys for assembling aluminum heat exchangers by brazing which consist essentially of 4.5 to 13.5% of Si, 0.05 to 0.5% of Ca and the balance essentially Al and, additionally may contain Mg in the range of 0.3 to 3.0% or at least Cu component of 2.3 to 4.7% of Cu and 9.3 to 10.7% of Zn. The aluminum brazing alloys have an excellent brazability and provide high strength brazed joints with highly refined microstructure. Such superior properties make the brazing alloys especially suited for the fabrication of superhigh pressure heat exchangers.
Inventors
- 👤 Michiki Hagiwara
- 👤 Keizo Nanba
- 👤 Shosuke Iwasaki
- 👤 Tetsuo Abiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:17
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B23K35/288; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
34 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.21 to 0.5% of Ca and balance essentially aluminum.
Claim 2
Dependent Claim
34 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.21 to 0.5% of Ca and balance essentially aluminum.
Claim 3
Dependent Claim
39 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.08 to 0.5% of Ca, 0.3 to 3.0% of Mg and balance essentially aluminum.
Claim 4
Dependent Claim
39 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.08 to 0.5% of Ca, 0.3 to 3.0% of Mg and balance essentially aluminum.
Claim 5
Dependent Claim
40 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.05 to 0.5% of Ca, 2.3 to 4.7% of Cu and the balance essentially aluminum.
Claim 6
Dependent Claim
40 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.05 to 0.5% of Ca, 2.3 to 4.7% of Cu and the balance essentially aluminum.
Claim 7
Dependent Claim
25 words
A brazing material as claimed in claim 2 consisting of about 10% Si, about 1.5% Mg, from 0.08 to 0.50% Ca, the balance being aluminum.
Claim 8
Dependent Claim
25 words
A brazing material as claimed in claim 3 consisting of about 10% Si, about 4% Cu, from 0.05 to 0.50% Ca, the balance being aluminum.
Claim 9
Dependent Claim
28 words
A brazing material as claimed in claim 3 consisting of about 10% Si, about 4% Cu, about 10% Zn, from 0.05 to 0.50% Ca, the balance being aluminum.
Claim 10
Dependent Claim
22 words
A brazing method which comprises: brazing aluminum structural members using as a filler, an aluminum brazing material as claimed in claim 1.
Claim 11
Dependent Claim
22 words
A brazing method which comprises: brazing aluminum structural members using as a filler, an aluminum brazing material as claimed in claim 2.
Claim 12
Dependent Claim
22 words
A brazing method which comprises: brazing aluminum structural members using as a filler, an aluminum brazing material as claimed in claim 3.
Claim 13
Dependent Claim
46 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.05 to 0.5% of Ca, 2.3 to 4.7% of Cu and 9.3 to 10.7% of Zn and the balance essentially aluminum.
Claim 14
Dependent Claim
46 words
An aluminum brazing material used for assembling an aluminum heat exchanger by brazing, said aluminum brazing material consisting essentially of 4.5 to 10% of Si, 0.05 to 0.5% of Ca, 2.3 to 4.7% of Cu and 9.3 to 10.7% of Zn and the balance essentially aluminum.
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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |