US2791499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing refractory metal compounds
Assignee: Ethyl Corp
•
Filing: 1953-07-13
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Granted: 1957-05-07
•
Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Clegg John William
- 👤 Meeley William Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
C; C22; C22B; C22B34/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR PRODUCING A REFRACTROY METAL HAVING A MELTING POINT ABOVE ABOUT 1700* C. WHICH COMPRISES REDUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HALIDES, SULFIDES AND SULFATES OF THE REFRATORY METALS WITH AN ALKALI METAL IN AN ESSENTIALLY INERT ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES CAUSING SAID COMPOUND TO REACT WITH ALKALI METAL IN THE FORM OF DISPERSED PARTICLES OF AVERAGE SIZE NO GREATER THAN ABOUT 50 MICRONS SUSPENDED IN AN INERT LIQUID HYDROCARBON MEDIUM AT A TEMPERATURE NO GREATER THAN ABOUT 150 TO 200* C.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR PRODUCING A REFRACTROY METAL HAVING A MELTING POINT ABOVE ABOUT 1700* C. WHICH COMPRISES REDUCING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF HALIDES, SULFIDES AND SULFATES OF THE REFRATORY METALS WITH AN ALKALI METAL IN AN ESSENTIALLY INERT ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES CAUSING SAID COMPOUND TO REACT WITH ALKALI METAL IN THE FORM OF DISPERSED PARTICLES OF AVERAGE SIZE NO GREATER THAN ABOUT 50 MICRONS SUSPENDED IN AN INERT LIQUID HYDROCARBON MEDIUM AT A TEMPERATURE NO GREATER THAN ABOUT 150 TO 200* C.
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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) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |