US4098957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum brazing sheet
Assignee: Alcoa Corp
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Filing: 1977-11-25
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Granted: 1978-07-04
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Expires: 1997-11-25
Abstract
Abstract An aluminum brazing sheet comprises a core of an aluminum alloy and a first layer of an aluminum brazing alloy provided on at least one side of the core to form a composite. A second layer of an aluminum alloy is clad on both sides of the composite. The aluminum alloy of the second layer contains 0.5 to 1.2 wt.% Mg and 1.2 to 1.8 wt.% Si. In addition, the aluminum alloy of the second layer can contain 0.2 wt.% Cu max., 0.7 wt.% Fe max., 1.5 wt.% Mn max., the remainder aluminum and incidental impurities. The second layer has a melting point substantially equivalent to the melting point of the brazing layer.
Inventors
- 👤 William D. Vernam
- 👤 Joseph W. Evancho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:01
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
An aluminum brazing sheet comprising: (a) a core of an aluminum alloy; (b) a first layer of an aluminum brazing alloy consisting essentially of 0.1 to 2.5 wt.% Mg, 5.0 to 13.0 wt.% Si, 0.8 wt.% Fe max., 0.3 wt.% Cu max., 0.3 wt.% Zn max. and 0.3 wt.% Mn max., the remainder aluminum, provided on at least one side of said core to form a composite; and (c) a second layer of an aluminum alloy clad on both sides of the composite, said second layer consisting essentially of 0.5 to 1.2 wt.% Mg, 1.2 to 1.8 wt.% Si, 0.2 wt.% Cu max., 0.7 wt.% Fe max., 1.5 wt.% Mn max., the remainder aluminum said alloy in said second layer having a melting point substantially equivalent to the melting point of said brazing layer.
Claim 2
Dependent Claim
134 words
An aluminum brazing sheet comprising: (a) a core of an aluminum alloy; (b) a first layer of an aluminum brazing alloy consisting essentially of 0.1 to 2.5 wt.% Mg, 5.0 to 13.0 wt.% Si, 0.8 wt.% Fe max., 0.3 wt.% Cu max., 0.3 wt.% Zn max. and 0.3 wt.% Mn max., the remainder aluminum, provided on at least one side of said core to form a composite; and (c) a second layer of an aluminum alloy clad on both sides of the composite, said second layer consisting essentially of 0.5 to 1.2 wt.% Mg, 1.2 to 1.8 wt.% Si, 0.2 wt.% Cu max., 0.7 wt.% Fe max., 1.5 wt.% Mn max., the remainder aluminum said alloy in said second layer having a melting point substantially equivalent to the melting point of said brazing layer.
Claim 3
Dependent Claim
45 words
The brazing sheet according to claim 1 wherein the core consists essentially of 1.5 wt.% Mn max., 0.7 wt.% Mg max., 0.5 wt.% Si max., 0.7 wt.% Fe max., 0.25 wt.% Cu max., 3.0 wt.% Zn max. and 0.25 wt.% Cr max., the remainder aluminum.
Claim 4
Dependent Claim
21 words
The brazing sheet according to claim 1 wherein the second layer of aluminum alloy contains less than 0.5 wt.% excess Mg.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |