US3833484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an integral colored anodic oxide on aluminum pressure die castings
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1972-02-18
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Granted: 1974-09-03
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Expires: 1992-02-18
Abstract
Abstract An integral colored anodic oxide film free from irregular patterns of metal flow, seams and cold shuts can be formed on die castings by subjecting the surface of pressure die castings of an aluminum alloy comprising 0.1 - 1.3 percent by weight of chromium, 0.2 - 3.4 percent by weight of manganese, said chromium and manganese being present in the amounts which are within the area of quadrilateral ABCD shown in the FIGURE, up to 0.3 percent by weight of impurities and the balance of aluminum, to roughening and brightening treatments, and thereafter subjecting thus treated products to anodizing treatment. Mechanical strength and castability of the alloy is further improved by addition of cobalt or zinc.
Inventors
- 👤 K Yanagida
- 👤 I Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:52
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14; C22; C22C; C22C21/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
The method according to claim 1, wherein the amounts of chromium and manganese contained in said aluminum alloy are within the area of pentagonal DEFGH shown in FIG. 1.
Claim 2
Dependent Claim
19 words
The method according to claim 1, wherein said aluminum alloy additionally comprises up to 0.2 percent by weight iron.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein said aluminum alloy additionally comprises up to 0.1 percent by weight silicon.
Claim 4
Independent Claim
145 words
A method for forming a uniform, even, integral colored film on aluminum die castings, comprising: subjecting the surface of an aluminum pressure die casting to a series of steps, said aluminum casting comprising an aluminum alloy comprising 0.1-1.3 percent by weight chromium; 0.2-3.4 percent by weight manganese; said chromium and manganese present in amounts within the area of quadrilateral ABCD shown in FIG. 1; up to 0.3 percent by weight impurities; 0.1-5.0 percent by weight zinc; and the balance of aluminum; said steps comprising: subjecting said aluminum pressure die casting to roughening treatment, then subjecting said aluminum casting to brightening treatment, and thereafter subjecting the aluminum casting to anodizing treatment in an aqueous electrolyte containing 5-20 percent by weight sulfuric acid, for forming an integral, uniform anodic oxide film having a color selected from the group consisting of gold, yellowish brown, brown and reddish brown.
Claim 5
Dependent Claim
29 words
The method according to claim 5, wherein the amounts of chromium and manganese contained in said aluminum alloy are within the area of pentagonal DEFGH shown in FIG. 1.
Claim 6
Dependent Claim
19 words
The method according to claim 5, wherein said aluminum alloy additionally comprises up to 0.2 percent by weight iron.
Claim 7
Dependent Claim
19 words
The method according to claim 5, wherein said aluminum alloy additionally comprises up to 0.1 percent by weight silicon.
Claim 8
Dependent Claim
18 words
A method according to claim 5, wherein said aluminum alloy additionally contains 0.005-0.8 percent by weight of cobalt.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |