US3660049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion strengthened electrical heating alloys by powder metallurgy
Assignee: Huntington Alloys Corp
•
Filing: 1969-08-27
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Granted: 1972-05-02
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Expires: 1989-08-27
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
- 👤 John Stanwood Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:26
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
The article of manufacture of claim 1, wherein the chromium content is at least about 15 per cent and wherein the dispersoid ranges from about 0.05 to 10 volume per cent of the total composition, said wrought shape containing less than 5 volume per cent of segregated regions exceeding 1 micron in minimum dimension.
Claim 2
Dependent Claim
30 words
The article of manufacture of claim 1, wherein the composition contains 30 per cent to 75 per cent nickel when the iron content is less than about 45 per cent.
Claim 3
Dependent Claim
52 words
The article of manufacture of claim 1, wherein the chromium content ranges by weight from about 15 percent to 40 per cent, the aluminum from about 3 per cent to 20 per cent, and a dispersoid is at a volume loading of about 0.05 to 5 per cent of the total composition.
Claim 4
Dependent Claim
36 words
The article of manufacture of claim 4, wherein the dispersoid has an average particle size ranging from about 10 to 1,000 Angstroms, and is selected from the group consisting of yttria, lanthana, ceria, zirconia and thoria.
Claim 5
Dependent Claim
41 words
The article of manufacture of claim 1, wherein the composition contains by weight about 31.5 per cent aluminum and approximately 68.5 per cent nickel, the amount of dispersoid ranging from about 0.05 to 5 volume per cent of the total composition.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |