US4787943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion strengthened aluminum-base alloy
Assignee: United States Department of the Air Force
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Filing: 1987-04-30
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Granted: 1988-11-29
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Expires: 2007-04-30
Abstract
Abstract An aluminum alloy containing about 2 to 6 weight percent titanium, about 3 to 11 weight percent of a rare earth of the Lanthanide Series and up to about 3 weight percent of at least one Group VIII metal, balance aluminum, is disclosed. The alloy is preferably prepared by rapid solidification in powder, particulate or ribbon form, and is subsequently compacted under controlled conditions.
Inventors
- 👤 Yashwant R. Mahajan
- 👤 Susan D. Kirchoff
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:08
CPC Classifications
C; C22; C22C; C22C21/00; B; B22; B22F; B22F9/00; B22F9/002; B22F9/008; C22C45/00; C22C45/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
An aluminum alloy dispersion strengthened with at least one rare earth metal consisting essentially of about 2 to 6 weight percent titanium, about 3 to 11 weight percent of at least one rare earth of the Lanthanide Series and up to about 3 weight percent of at least one Group VIII element, balance aluminum.
Claim 2
Dependent Claim
54 words
An aluminum alloy dispersion strengthened with at least one rare earth metal consisting essentially of about 2 to 6 weight percent titanium, about 3 to 11 weight percent of at least one rare earth of the Lanthanide Series and up to about 3 weight percent of at least one Group VIII element, balance aluminum.
Claim 3
Dependent Claim
18 words
The alloy of claim 1 wherein the maximum atomic ratio of titanium to rare earth is about 2:1.
Claim 4
Dependent Claim
17 words
The alloy of claim 1 containing about 0.1 to 3.0 weight percent of said Group VIII element.
Claim 5
Dependent Claim
12 words
The alloy of claim 1 wherein said Group VIII element is iron.
Claim 6
Dependent Claim
11 words
The alloy of claim 1 wherein said rare earth is gadolinium.
Claim 7
Dependent Claim
10 words
The alloy of claim 1 having the approximate composition Al-4Ti-4Gd.
References Cited (Backward Citations)
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US3909247A
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US3876474A
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US4213799A
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US4213800A
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US4464199A
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US4624705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |