US3107165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of tantalum metal by reduction of the oxygen content by means of carbon
Assignee: National Research Corp
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Filing: 1961-10-12
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Granted: 1963-10-15
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Expires: 1981-10-12
Abstract
No abstract record available.
Inventors
- 👤 John L Ham
- 👤 Jr Maurice L Torti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:41
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE PROCESS OF PRODUCING TANTALUM METAL HAVING IMPURITY LEVELS OF CARBON AND OXYGEN EACH LESS THAN 100 P.P.M., COMPRISING FORMING A TANTALUM ELECTRODE FROM TANTALUM METAL HAVING AN OXYGEN CONTENT OF LESS THAN 0.1%, INCORPORATING IN SAID ELECTRODE SUFFICIENT CARBON TO PROVIDE 50 TO 75% OF THE STOICHIOMETRIC AMOUNT OF CARBON NEEDED TO COMBINE WITH THE OXYGEN IN SAID TAN TALUM METAL TO FORM CARBON MONOXIDE, MELTING SAID ELECTRODE IN A VACUUM ARE FURNACE AT A PRESSURE OF LESS THAN 25 MICRONS HG ABS. WITH A POWER INPUT OF AT LEAST 1 KW.H./LB. TO REMOVE CARBON AND OXYGEN AND FORM AN INGOT OF SAID MELTED METAL.
Claim 2
Dependent Claim
106 words
THE PROCESS OF PRODUCING TANTALUM METAL HAVING IMPURITY LEVELS OF CARBON AND OXYGEN EACH LESS THAN 100 P.P.M., COMPRISING FORMING A TANTALUM ELECTRODE FROM TANTALUM METAL HAVING AN OXYGEN CONTENT OF LESS THAN 0.1%, INCORPORATING IN SAID ELECTRODE SUFFICIENT CARBON TO PROVIDE 50 TO 75% OF THE STOICHIOMETRIC AMOUNT OF CARBON NEEDED TO COMBINE WITH THE OXYGEN IN SAID TAN TALUM METAL TO FORM CARBON MONOXIDE, MELTING SAID ELECTRODE IN A VACUUM ARE FURNACE AT A PRESSURE OF LESS THAN 25 MICRONS HG ABS. WITH A POWER INPUT OF AT LEAST 1 KW.H./LB. TO REMOVE CARBON AND OXYGEN AND FORM AN INGOT OF SAID MELTED METAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-14 | 1967-04-15 | 1967-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-14 | 1971-04-15 | 1971-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-14 | 1975-04-15 | 1975-10-15 | $7700.00 | Window Closed / Lapsed |