US3579808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tantalum clad niobium
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-03-20
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Granted: 1971-05-25
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Expires: 1989-03-20
Abstract
Abstract This invention relates to composite metal article and method for making the same wherein tantalum metal is applied to the surface of niobium metal and the two metals are diffusion bonded in a protective environment. The bonded metals may be cold worked to produce the final fabricated article.
Inventors
- 👤 Melvin A Hagan
- 👤 Roy I Batista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:37
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/02; B23K20/023; B23K20/04; B23K20/22; B23K20/233; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12819
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA699431A
Cited
US3170234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |