Patent US2556912A successfully refreshed from Google Patents.
US2556912A
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Thermal process for producing pure tantalum and columbium compounds
Assignee: Individual
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Filing: 1946-09-14
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Granted: 1951-06-12
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Expires: 1966-09-14
Abstract
No abstract record available.
Inventors
- 👤 Gardner Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:29
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C01; C01G; C01G33/00; C01P; C01P2006/00; C01P2006/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE THERMAL PROCESS FOR TREATING STARTING MATERIAL CONTAINING A METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF TANTALUM PENTOXIDE. COLUMBIUM PENTOXIDE, TANTALUM PENTACHLORIDE, COLUMBIUM PENTACHLORIDE, TANTALUM PENTAFLUORIDE, COLUMBIUM PENTAFLUORIDE AND MIXTURES THEREOF, TO CONVERT SUCH COMPOUND TO THE SULPHIDE; SAID PROCESS COMPRISING MIXING WITH SUCH STARTING MATERIAL, IN POWDERY FORM, A SULPHIDIZING AGENT, AND AN ALKALINE-EARTH HYDRIDE; AND IN A NON-OXIDIZING ATMOSPHERE SUBJECTING SUCH MIXTURE TO AN ELEVATED REACTION TEMPERATURE BETWEEN ABOUT 600* AND 750* C., THUS TO BRING ABOUT A REACTION WHEREIN THE METAL COMPOUND CONTAINED IN SUCH STARTING MATERIAL IS CHEMICALLY CONVERTED TO THE SULPHIDE, SEPARABLE FROM OTHER REACTION PRODUCTS.
Claim 2
Dependent Claim
102 words
THE THERMAL PROCESS FOR TREATING STARTING MATERIAL CONTAINING A METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF TANTALUM PENTOXIDE. COLUMBIUM PENTOXIDE, TANTALUM PENTACHLORIDE, COLUMBIUM PENTACHLORIDE, TANTALUM PENTAFLUORIDE, COLUMBIUM PENTAFLUORIDE AND MIXTURES THEREOF, TO CONVERT SUCH COMPOUND TO THE SULPHIDE; SAID PROCESS COMPRISING MIXING WITH SUCH STARTING MATERIAL, IN POWDERY FORM, A SULPHIDIZING AGENT, AND AN ALKALINE-EARTH HYDRIDE; AND IN A NON-OXIDIZING ATMOSPHERE SUBJECTING SUCH MIXTURE TO AN ELEVATED REACTION TEMPERATURE BETWEEN ABOUT 600* AND 750* C., THUS TO BRING ABOUT A REACTION WHEREIN THE METAL COMPOUND CONTAINED IN SUCH STARTING MATERIAL IS CHEMICALLY CONVERTED TO THE SULPHIDE, SEPARABLE FROM OTHER REACTION PRODUCTS.
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) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |