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US3622308A
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Hafnium base alloy (iridium)
Assignee: IIT Research Institute
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Filing: 1968-10-21
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Granted: 1971-11-23
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Expires: 1988-10-21
Abstract
Abstract Hafnium base alloy containing between about 15 and about 35 weight percent tantalum and between about 2 and about 20 weight percent iridium. The alloy may also contain aluminum, silicon or chromium as additional alloying agents.
Inventors
- 👤 Vernon L Hill
- 👤 Harry R Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:45
CPC Classifications
C; C22; C22C; C22C27/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
A hafnium base alloy in accordance with claim 1 comprising between about 20 and about 30 weight percent tantalum.
Claim 2
Dependent Claim
18 words
A hafnium base alloy in accordance with claim 1 comprising between about 0.5 and 2.5 weight percent aluminum.
Claim 3
Dependent Claim
19 words
A hafnium base alloy in accordance with claim 1 comprising between about 0.5 and about 1.6 weight percent silicon.
Claim 4
Dependent Claim
29 words
A hafnium base alloy in accordance with claim 1 comprising between about 0.5 and about 2.0 weight percent aluminum and between about 0.5 and about 1.0 weight percent silicon.
Claim 5
Dependent Claim
21 words
A hafnium base alloy in accordance with claim 2 comprising about 1.3 weight percent aluminum and about 0.8 weight percent silicon.
Claim 6
Dependent Claim
15 words
A hafnium base alloy in accordance with claim 6 comprising about 0.6 weight percent chromium.
References Cited (Backward Citations)
US3446615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |