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US4172923A
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US
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Composite material for vacuum brazing
Assignee: Furukawa Aluminum Co Ltd
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Filing: 1978-06-12
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Granted: 1979-10-30
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Expires: 1998-06-12
Abstract
Abstract This invention relates to a composite material for vacuum brazing comprising a cladding material for vacuum brazing composed of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of at least one member selected from the group consisting of calcium, sodium and potassium and the balance of aluminum, and a core material consisting of aluminum or an aluminum alloy having said cladding material clad onto one surface of both surfaces thereof.
Inventors
- 👤 Hiroshi Kawase
- 👤 Motoyoshi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; B; B32; B32B; B32B15/00; B32B15/01; B32B15/016; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764; Y10T428/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A composite material for vacuum brazing comprising an aluminum alloy consisting of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of at least one member selected from the group consisting of calcium, sodium and potassium, the balance of aluminum as the cladding material, and aluminum or an aluminum base alloy as the core material having said cladding material clad onto one or both surfaces thereof, said cladding material having a lower electrode potential than said core material, whereby said cladding material exhibits a cathodic protection effect.
Claim 2
Dependent Claim
86 words
A composite material for vacuum brazing comprising an aluminum alloy consisting of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of at least one member selected from the group consisting of calcium, sodium and potassium, the balance of aluminum as the cladding material, and aluminum or an aluminum base alloy as the core material having said cladding material clad onto one or both surfaces thereof, said cladding material having a lower electrode potential than said core material, whereby said cladding material exhibits a cathodic protection effect.
Claim 3
Dependent Claim
45 words
The composite material for vacuum brazing as defined in claim 1 wherein when said composite material is a sheet, said composite material is obtained by superposing said cladding material on said core material in the ingot form and hot rolling them together and cold rolling.
Claim 4
Dependent Claim
39 words
The composite material for vacuum brazing as defined in claim 1 wherein when said composite material is a tube, said composite material is obtained by roll-forming a clad sheet in a tubular form and electro-welding the contacting surfaces thereof.
Claim 5
Dependent Claim
52 words
The composite material for vacuum brazing as defined in claim 1 wherein when said composite material is a tube, said composite material is obtained by shaping in advance said core material and said cladding material in a tubular form, composing them together and extrusion-forming the composite tube and drawing the composite tube.
Claim 6
Dependent Claim
36 words
The composite material for vacuum brazing as defined in claim 1 wherein the composite ratio of said cladding material to the total thickness of said composite material is in the range of from 3 to 20%.
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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |