Patent US4005243A successfully refreshed from Google Patents.
US4005243A
Expired / Lapsed
US
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Freely machinable aluminum alloy
Assignee: Sumitomo Light Metal Industries Ltd
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Filing: 1975-07-18
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Granted: 1977-01-25
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Expires: 1995-07-18
Abstract
Abstract An aluminum alloy with freely-machinable or free-cutting properties and corrosion resistance consists essentially of aluminum, copper, magnesium, tin, lead, and silicon and optionally further contains small amounts of any one or more of the elements selected from chromium, manganese, titanium, vanadium and zirconium. This alloy has the property for preventing peeling-off of an anodically oxidized surface layer after being heated at an elevated temperature.
Inventors
- 👤 Yoshio Baba
- 👤 Akira Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:48
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
An aluminum base alloy of free machinability and of corrosion resistance, consisting essentially of: from 0.6 to 1.2 weight percent magnesium, from 1.2 to 2.4 weight percent of the sum of tin and lead, wherein the weight quantity of tin exceeds that of lead; from 0.5 to 0.8 weight percent silicon; from 0.1 to 0.4 weight percent copper; and the balance essentially aluminum and inevitable impurities.
Claim 2
Dependent Claim
66 words
An aluminum base alloy of free machinability and of corrosion resistance, consisting essentially of: from 0.6 to 1.2 weight percent magnesium, from 1.2 to 2.4 weight percent of the sum of tin and lead, wherein the weight quantity of tin exceeds that of lead; from 0.5 to 0.8 weight percent silicon; from 0.1 to 0.4 weight percent copper; and the balance essentially aluminum and inevitable impurities.
Claim 3
Dependent Claim
20 words
An aluminum base alloy according to claim 1 further containing chromium in an amount from 0.05 to 0.3 weight percent.
Claim 4
Dependent Claim
54 words
An aluminum base alloy according to claim 1 consisting essentially of: from 0.6 to 1.2 weight percent magnesium; from 0.8 to 1.6 weight percent tin; from 0.4 to 0.8 weight percent lead; from 0.5 to 0.8 weight percent silicon; from 0.1 to 0.4 weight percent copper; and the balance essentially aluminum and inevitable impurities.
Claim 5
Dependent Claim
48 words
An aluminum base alloy according to claim 1 further containing optionally any one or more than one element of: from 0.1 to 0.5 weight percent manganese; from 0.02 to 0.2 weight percent titanium; from 0.05 to 0.3 weight percent vanadium; and from 0.05 to 0.3 weight percent zirconium.
Claim 6
Dependent Claim
18 words
An aluminum base alloy according to claim 1 containing beryllium in an amount up to 0.03 weight percent.
Claim 7
Dependent Claim
47 words
An aluminum base alloy according to claim 2 containing optionally any one or more than one element of: from 0.1 to 0.5 weight percent manganese; from 0.2 to 0.2 weight percent titanium; from 0.05 to 0.3 weight percent vanadium; and from 0.5 to 0.3 weight percent zirconium.
Claim 8
Dependent Claim
34 words
A product made of an aluminum base alloy according to claim 2 with a portion thereof being anodically oxidized, coated with resinous paint thereon and cured at an elevated temperature higher than 160° C.
Claim 9
Dependent Claim
34 words
A product made of an aluminum base alloy according to claim 6, with a portion thereof being anodically oxidized, coated with resinous paint thereon and cured at an elevated temperature higher than 160° C.
References Cited (Backward Citations)
US3161502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |