US3592639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tantalum-tungsten alloy
Assignee: Fansteel Inc
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Filing: 1968-08-19
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Granted: 1971-07-13
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Expires: 1988-08-19
Abstract
Abstract A NOVEL ALLOY IS DISCLOSED CONSISTING ESSENTIALLY OF FROM 1.5 TO 3.5 WEIGHT PERCENT OF TUNGSTEN, THE BALANCE OF THE ALLOY BEING ESSENTIALLY TANTALUM, OPTIONALLY, THE ALLOY CONTAINS FROM 0.05 TO 0.5 WEIGHT OF COLUMBIUM. THESE ALLOYS HAVE IMPROVED STRENGTH WHEN COMPARED WITH PURE TANTALUM, YET THEY ARE COLD WORKABLE IN CONVENTIONAL EQUIPMENT FOR COLD-WORKING TANALUM, UNLIKE THE KNOWN TANTALUM ALLOYS HAVING HIGHER CONCENTRATIONS OF TUNGSTEN. ALSO, THE ALLOYS DISCLOSED HEREIN SHOW IMPROVED CORROSION RESISTANCE OVER PURE TANTALUM AND THE KNOWN TANTALUM-TUNGSTEN ALLOYS HAVING A HIGHER TUNGSTEN CONCENTRATION .
Inventors
- 👤 Mortimer Schussler
- 👤 Victor T Bates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:29
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |