US3778249A
Expired / Lapsed
US
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Dispersion strengthened electrical heating alloys by powder metallurgy
Assignee: Huntington Alloys Corp
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Filing: 1970-06-09
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Granted: 1973-12-11
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Expires: 1990-06-09
Abstract
Abstract This invention relates to the powder metallurgy of wrought, dispersion strengthened, electrical heating elements characterized metallographically by a uniform distribution of dispersoids in both the longitudinal and transverse directions, and also to a powder metallurgy method for producing the same.
Inventors
- 👤 Benjamin J Stanwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:02
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/10; C22C1/1084; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/36; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951; Y10S75/956
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
A mechanically alloyed metal powder according to claim 1 wherein the dispersoid ranges from about 0.05 to about 10 volume percent, is selected from the group consisting of yttria, lanthana, ceria, zirconia and thoria.
Claim 2
Dependent Claim
31 words
A mechanically alloyed metal powder according to claim 1 wherein the nickel content is about 30 percent to about 75 percent when the iron content is less than about 45 percent.
Claim 3
Dependent Claim
52 words
A mechanically alloyed metal powder according to claim 2 containing, by weight, about 15 to about 40 percent of chromium and about 3 to about 20 percent aluminum, the dispersoid volume loading is about 0.05 to about 5 percent and the averAge dispersoid particle size is about 10 to about 1,000 Angstroms.
Claim 4
Dependent Claim
32 words
A mechanically alloyed metal powder, the particles of which are of substantially saturation hardness, and of the composition consisting essentially of, by weight, about 31.5 percent aluminum and about 68.5 percent nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |