US3597192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tantalum metal
Assignee: Cabot Corp
•
Filing: 1968-12-05
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Granted: 1971-08-03
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Expires: 1988-12-05
Abstract
Abstract THIS INVENTION RELATES TO AN IMPROVED METHOD OF PREPARING HIGH-PURITY TANTALUM METAL BY THE ALUMINO-THERIC REDUCTION OF TA2O5. BY ADDING SELECTED ALLOYING AGENTS TO THE ALUMINUM AND TANTALUM OXIDE, A MASSIVE METAL ALLOY READILY SEPARABLE FROM THE SLAG IS PRODUCED UPON REDUCTION OF THE MIXTURE. THE HIGH-PURITY TANTALUM METAL IS THEN RECOVERED BY HEATING THE ALLOY UNDER REDUCED PRESSURE TO A TEMPERATURE SUFFICIENT TO BOIL OFF THE ALLOYING METALS.
Inventors
- 👤 Harley A Wilhelm
- 👤 Frederick A Schmidt
- 👤 Roger M Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:02
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; Y; Y10; Y10S; Y10S75/00; Y10S75/959
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |