US3793089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum sheet
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1971-12-22
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Granted: 1974-02-19
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Expires: 1991-12-22
Abstract
Abstract This invention relates to an improved aluminum sheet material which, when integral color anodized, forms an anodic coating having a color from gold to black within a commercially acceptable thickness range. The alloy composition is essentially 0.05-0.20 percent silicon, 0.15-0.40 percent iron, 0.15-0.30 percent copper, 0.10-0.30 percent manganese, 0.6-1.0 percent magnesium, 0.04-0.12 percent chromium, and the balance aluminum and inconsequential amounts of other elements. In the process of forming the sheet product the alloy is cast into an ingot, homogenized at a temperature between about 1,000*F and 1,125*F and hot rolled to a desired thickness.
Inventors
- 👤 F Howard
- 👤 R Dorward
- 👤 E Beatty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
C; C22; C22C; C22C21/00; C25; C25D; C25D11/00; C25D11/02; C25D11/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
The method of claim 1 wherein the aluminum alloy consists essentially of 0.08-0.14 percent silicon, 0.15-0.25 percent iron, 0.16-0.25 percent copper, 0.16-0.25 percent manganese, 0.70-0.90 percent magnesium, 0.04-0.08 percent chromium, and the balance aluminum and inconsequential amounts of other elements.
Claim 2
Dependent Claim
18 words
The method of claim 1 wherein the resultant sheet product is cold rolled at a temperature below 250*F.
Claim 3
Dependent Claim
57 words
The preparation of aluminum sheet products by the method of claim 1 from a plurality of ingots which have been homogenized in separate loads wherein the homogenization temperature from load to load does not vary by more than + or - 30* but in no instance is the homogenizing temperature less than 1,000*F. or greater than 1,125*F.
Claim 4
Dependent Claim
124 words
An aluminum sheet material formed by a. prepaRing an ingot of an aluminum alloy consisting essentially of from 0.05-0.20 percent silicon, 0.15-0.40 percent iron, 0.15-0.30 percent copper, 0.10-0.30 percent manganese, 0.6-1.0 percent magnesium, 0.04-0.12 percent chromium, and the balance aluminum and inconsequential amounts of other elements; b. heating said ingot at a rate less than 100*F/hr. to homogenizing temperature; c. homogenizing said ingot at a temperature from 1,000*F. to 1, 125*F. for a period from 4-24 hours; and d. hot rolling said ingot to sheet gauge, said sheet material characterized by metallurgical structure which allows for the formation of anodic oxide coating between 0.5 and 1.5 mils thick having a color from light gold to black when anodized in an integral color anodizing electrolyte.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |