Patent US4930566A successfully refreshed from Google Patents.
US4930566A
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US
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Method for continuous casting of an aluminum-lithium alloy
Assignee: Resonac Holdings Corp
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Filing: 1989-09-22
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Granted: 1990-06-05
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Expires: 2009-09-22
Abstract
Abstract In a method for continuous casting of an aluminum-lithium alloy through an open-ended mold for forming an ingot, wherein gas under pressure is brought into contact with a molten surface part of said ingot directly before solidification, the gas used consists of from 1 to 15 volume % of oxygen and balance of inert gas. The casting is stabilized and cast skin is improved by the use of said gas.
Inventors
- 👤 Shigeru Yanagimoto
- 👤 Ryoichi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:24
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/04; B22D11/045; B22D11/0401; B22D11/10; B22D11/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A method for continuous casting of an aluminum-lithium alloy through an open-ended mold for forming an ingot, comprising, contacting a pressurized gas with a molten surface part directly before solidication, characterized in that said pressurized gas consists of from 1 to 15 volume % of oxygen and balance of inert gas.
Claim 2
Independent Claim
51 words
A method for continuous casting of an aluminum-lithium alloy through an open-ended mold for forming an ingot, comprising, contacting a pressurized gas with a molten surface part directly before solidication, characterized in that said pressurized gas consists of from 1 to 15 volume % of oxygen and balance of inert gas.
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein lubricating agent is fed to an inner circumferential surface of the open-ended mold, and pressure is applied to a circumferential part of the ingot, directly before the solidification.
Claim 4
Dependent Claim
27 words
A method according to claim 1, wherein said inert gas is at least one gas selected from the group consisting of nitrogen, argon, carbon dioxide, and helium.
Claim 5
Dependent Claim
15 words
A method according to claim 3, wherein the continuous casting method is a vertical casting.
Claim 6
Dependent Claim
15 words
A method according to claim 3, wherein the continuous casting method is a horizontal casting.
Claim 7
Dependent Claim
23 words
A method according to claim 1, 2, 3, 4, or 5, wherein said aluminum-lithium alloy contains 0.5% by weight or more of lithium.
Claim 8
Dependent Claim
19 words
A method according to claim 6, wherein said aluminum-lithium alloy contains from 0.5 to 5% by weight of lithium.
References Cited (Backward Citations)
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |