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Patent US4951735A successfully refreshed from Google Patents.
US4951735A
Expired / Lapsed
US
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Melting and casting of beta titanium alloys
Assignee: RTX Corp
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Filing: 1986-01-02
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Granted: 1990-08-28
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Expires: 2006-01-02
Abstract
Abstract Improved technology for the melting and casting of a particular class of true beta-type titanium alloys is described. A typical alloy is titanium--35% vanadium--15% chromium. By providing carbon surfaces for contacting molten beta titanium alloys of this type improved melting and casting procedures are effectuated.
Inventors
- 👤 Douglas M. Berczik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:24
CPC Classifications
B; B22; B22D; B22D21/00; B22D21/002; B22D21/005; B22C; B22C1/00; B22C1/02; B22C1/04; B22C1/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A method of casting titanium alloy articles of the type based on Ti-V-Cr and containing more than about 10% Cr, more than about 20% V and more than about 40% Ti which comprises a. melting the alloy in a crucible having a carbon metal contacting surface, and without formation of a titanium skull; b. applying sufficient energy to heat the molten alloy to the desired superheat; c. casting said controlled superheat titanium alloy into a mold having a metal contacting surface which is essentially carbon.
Claim 2
Independent Claim
85 words
A method of casting titanium alloy articles of the type based on Ti-V-Cr and containing more than about 10% Cr, more than about 20% V and more than about 40% Ti which comprises a. melting the alloy in a crucible having a carbon metal contacting surface, and without formation of a titanium skull; b. applying sufficient energy to heat the molten alloy to the desired superheat; c. casting said controlled superheat titanium alloy into a mold having a metal contacting surface which is essentially carbon.
Claim 3
Dependent Claim
53 words
In the melting and casting of alloys which contain more than about 10% Cr, more than about 20% V and more than about 40% Ti, and are comprised essentially of beta titanium, the improvement which comprises providing at least a surface coating of essentially carbon on all surfaces which contact the molten alloy.
Claim 4
Dependent Claim
53 words
In the melting and casting of alloys which contain more than about 10% Cr, more than about 20% V and more than about 40% Ti, and are comprised essentially of beta titanium, the improvement which comprises providing at least a surface coating of essentially carbon on all surfaces which contact the molten alloy.
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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) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |