US3993476A
Expired / Lapsed
US
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Aluminum alloy
Assignee: Hitachi Ltd
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Filing: 1975-02-12
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Granted: 1976-11-23
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Expires: 1995-02-12
Abstract
Abstract A castable strong aluminum (Al)-zinc(Zn)-magnesium (Mg) alloy having good mechanical strength, no heat checks produced and improved castability has been provided by lowering the zinc content and increasing the magnesium content than those in prior aluminum-zinc-magnesium alloys.
Inventors
- 👤 Keiichi Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:51
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; C22C21/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0 - 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium and 0.05 - 0.5% titanium, said alloy additionally containing two or more of, by weight, 0.05 - 0.3% antimony, 0.05 - 0.2% cerium and 0.05 - 0.3% zirconium, the balance being aluminum and incidental impurities.
Claim 2
Dependent Claim
79 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0 - 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium and 0.05 - 0.5% titanium, said alloy additionally containing two or more of, by weight, 0.05 - 0.3% antimony, 0.05 - 0.2% cerium and 0.05 - 0.3% zirconium, the balance being aluminum and incidental impurities.
Claim 3
Dependent Claim
19 words
The castable strong aluminum alloy according to claim 1, which additionally contains 0.005 - 0.3% by weight of beryllium.
Claim 4
Dependent Claim
60 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0 - 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium, 0.05 - 0.5% titanium, and 0.05 - 0.3% antimony, the balance being aluminum and incidental impurities.
Claim 5
Dependent Claim
60 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0 - 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium, 0.05 - 0.5% titanium, and 0.05 - 0.3% antimony, the balance being aluminum and incidental impurities.
Claim 6
Dependent Claim
18 words
The castable strong aluminum alloy according to claim 3, which additionally contains, by weight, 0.05 to 0.2% cerium.
Claim 7
Dependent Claim
59 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0- 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium, 0.05 - 0.5% titanium, and 0.05 - 0.2% cerium, the balance being aluminum and incidental impurities.
Claim 8
Dependent Claim
59 words
A castable strong aluminum alloy consisting essentially of, by weight, 2.0 - 6.0% zinc and 3.0- 5.5% magnesium, the zinc and magnesium being present in amounts indicated by the hatched area in the drawing, and 0.5 - 1.5% copper, 0.05 - 0.5% chromium, 0.05 - 0.5% titanium, and 0.05 - 0.2% cerium, the balance being aluminum and incidental impurities.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |