Patent US2847298A successfully refreshed from Google Patents.
US2847298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing refractory metals
Assignee: National Research Corp
•
Filing: 1954-07-02
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Granted: 1958-08-12
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Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 James L Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:41
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1263; C22B34/1268; C22B34/1272; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN A PROCESS FOR MANUFACTURING A REFRACTORY METAL SELECTED FROM THE CLASS CONSISTING OF TITANIUM, ZIRCONIUM, VANADIUM, COLUMBIUM, TUNGSTEN, TANTALUM AND MOLYBDENUM, WHEREIN A SUBSTANTIAL QUANTITY OF A HALIDE OF SAID REFRACTORY METAL IS DISSOLVED IN A BATH OF A MOLTEN SALT WHICH IS INERT TO SAID HALIDE AND THE DISSOLVED REFRACTORY METAL HALIDE IS REDUCED TO REFRACTORY METAL BY MEANS OF A REDUCING AGENT COMPRISING AT LEAST ONE METAL FROM THE CLASS CONSISTING OF THE ALKALI METALS AND THE ALKALINE EARTH METALS MAGNESIUM AND CALCIUM, THE IMPROVEMENT WHICH COMPRISES POSITIONING A GRID IN THE BATH SO THAT AT LEAST A PORTION OF THE GRID IS BELOW THE SURFACE OF THE MOLTEN SALT BATH, AND FEEDING MOLTEN REDUCING AGENT TO THE GRID OVER AN EXTENDED PERIOD OF TIME.
Claim 2
Dependent Claim
128 words
IN A PROCESS FOR MANUFACTURING A REFRACTORY METAL SELECTED FROM THE CLASS CONSISTING OF TITANIUM, ZIRCONIUM, VANADIUM, COLUMBIUM, TUNGSTEN, TANTALUM AND MOLYBDENUM, WHEREIN A SUBSTANTIAL QUANTITY OF A HALIDE OF SAID REFRACTORY METAL IS DISSOLVED IN A BATH OF A MOLTEN SALT WHICH IS INERT TO SAID HALIDE AND THE DISSOLVED REFRACTORY METAL HALIDE IS REDUCED TO REFRACTORY METAL BY MEANS OF A REDUCING AGENT COMPRISING AT LEAST ONE METAL FROM THE CLASS CONSISTING OF THE ALKALI METALS AND THE ALKALINE EARTH METALS MAGNESIUM AND CALCIUM, THE IMPROVEMENT WHICH COMPRISES POSITIONING A GRID IN THE BATH SO THAT AT LEAST A PORTION OF THE GRID IS BELOW THE SURFACE OF THE MOLTEN SALT BATH, AND FEEDING MOLTEN REDUCING AGENT TO THE GRID OVER AN EXTENDED PERIOD OF TIME.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |