Patent US3721287A successfully refreshed from Google Patents.
US3721287A
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Method of continuously casting plate with textured surface
Assignee: Alcoa Corp
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Filing: 1971-11-19
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Granted: 1973-03-20
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Expires: 1991-11-19
Abstract
Abstract Decorative plate or sheet having an attractive textured surface is continuously cast in an open ended chilled mold. The freezing plate ingot has a surface solidified in a varying and cyclic fashion by applying thereto a volatile lubricant at a rate much higher than that normally employed in similar casting arrangements. The resulting plate exhibits a textured surface with accompanying variations in composition and metallurgical structure such that the response to electrolytic anodizing treatments varies and the anodized surface exhibits varying shades and colors.
Inventors
- 👤 C Howle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:56
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/07; B22D11/14; B22D11/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
The method according to claim 1 wherein the lubrication rate and the casting rate are maintained substantially constant.
Claim 2
Dependent Claim
15 words
continuously introducing said molten metal into said mold and withdrawing a solidified ingot plate therefrom,
Claim 3
Dependent Claim
99 words
applying to a surface of said metal a volatile lubricant at a rate of from 0.1 to 2 ml per minute per inch of surface width to cause the intermittent formation of lubricant vapor pockets to effect alternating higher and lower solidification rates in said surface thereby producing in said surface a texture having multiplicities of outer and inner faces, the outer faces having internal structural characteristics derived from a more rapid solidification rate than the inner faces, whereby to produce in said upper surface a texture having multiplicities of higher and lower faces having different constituent distribution patterns.
Claim 4
Dependent Claim
20 words
The method according to claim 1 wherein said lubricant rate ranges from 0.3 to 0.6 ml per minute per inch.
Claim 5
Dependent Claim
17 words
The method according to claim 1 wherein said upper surface has applied thereto an integral anodic coating.
Claim 6
Dependent Claim
17 words
The method according to claim 1 wherein said aluminum alloy contains from 3 to 13 percent silicon.
Claim 7
Dependent Claim
39 words
The method according to claim 5 wherein said alloy additionally contains one or more of the elements selected from the group consisting of up to 1 percent Mg, up to 0.7 percent Cr and up to 0.7 percent Cu.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |