Patent US1816526A successfully refreshed from Google Patents.
US2950185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tantalum powder
Assignee: National Research Corp
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Filing: 1958-06-13
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Granted: 1960-08-23
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Expires: 1978-06-13
Abstract
No abstract record available.
Inventors
- 👤 Edward G Hellier
- 👤 George L Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:50
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN THE PROCESS OF PRODUCING TANTALUM POWDER WHEREIN POTASSIUM FLUOTANTALATE IS REDUCED TO TANTALUM METAL BY MEANS OF SODIUM THE IMPROVEMENT WHICH COMPRISES CONFINING A BATH OF MOLTEN POTASSIUM FLUOTANTALATE IN A REACTOR AT A TEMPERATURE ABOVE 800*C., FEEDING MOLTEN SODIUM TO THE SURFACE OFTHE BATH AT A RATE IN EXCESS OF ONE POUND PER HOUR PER SQUARE FOOT OF BATH SURFACE AND AGITATING SAID BATH SUFFICIENTLY STRONGLY TO PROVIDE FOR RAPID UPWARD FLOW OF THE FUSED BATH AT ONE PORTION OF SAID BATH AND RAPID DOWNWARD FLOW AT ANOTHER PORTION OF SAID BATH SO AS TO PREVENT ANY SUBSTANTIAL STRATIFICATION BETWEEN THE BYPRODUCT AND THE POTASSIUM FLUOTANTALATE.
Claim 2
Dependent Claim
108 words
IN THE PROCESS OF PRODUCING TANTALUM POWDER WHEREIN POTASSIUM FLUOTANTALATE IS REDUCED TO TANTALUM METAL BY MEANS OF SODIUM THE IMPROVEMENT WHICH COMPRISES CONFINING A BATH OF MOLTEN POTASSIUM FLUOTANTALATE IN A REACTOR AT A TEMPERATURE ABOVE 800*C., FEEDING MOLTEN SODIUM TO THE SURFACE OFTHE BATH AT A RATE IN EXCESS OF ONE POUND PER HOUR PER SQUARE FOOT OF BATH SURFACE AND AGITATING SAID BATH SUFFICIENTLY STRONGLY TO PROVIDE FOR RAPID UPWARD FLOW OF THE FUSED BATH AT ONE PORTION OF SAID BATH AND RAPID DOWNWARD FLOW AT ANOTHER PORTION OF SAID BATH SO AS TO PREVENT ANY SUBSTANTIAL STRATIFICATION BETWEEN THE BYPRODUCT AND THE POTASSIUM FLUOTANTALATE.
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |