Patent US2904427A successfully refreshed from Google Patents.
US2904427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of refractory metals
Assignee: EIDP Inc
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Filing: 1955-12-21
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Granted: 1959-09-15
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frank E Edlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:45
CPC Classifications
C; C22; C22B; C22B34/00; B; B22; B22F; B22F1/00; B22F1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD FOR REDUCING THE SURFACE AREA OF A SPONGE METAL SELECTED FROM THE GROUP CONSISTING OF THE REFRACTORY METALS OF GROUP IV, GROUP V, AND GROUP VI OF THE PERIODIC SYSTEM ORIGINATING WITH MENDELEEFF, SAID METHOD COMPRISING SUSPENDING PARTICLES OF SAID METAL IN A MOLTEN SALT WHICH IS ESSENTIALLY INERT TO SAID METAL, PLACING THE SUSPENSION IN A HIGH FREQUENCY ELECTROMAGNETIC FIELD AND HEATING ONLY THE METAL TO A TEMPERATURE OF AT LEAST 1100* C., REMOVING THE SUSPENSION FROM SAID HIGH FREQUENCY FIELD, SEPARATING THE SPONGE METAL FROM THE MOLTEN SALT, COOLING SAID SPONGE METAL IN AN INERT ATMOSPHERE TO TEMPERATURES AT WHICH SAID METAL IS NON-REACTIVE WITH THE NORMAL ATMOSPHERE AND THEN RECOVERING THE TREATED METAL.
Claim 2
Independent Claim
118 words
A METHOD FOR REDUCING THE SURFACE AREA OF A SPONGE METAL SELECTED FROM THE GROUP CONSISTING OF THE REFRACTORY METALS OF GROUP IV, GROUP V, AND GROUP VI OF THE PERIODIC SYSTEM ORIGINATING WITH MENDELEEFF, SAID METHOD COMPRISING SUSPENDING PARTICLES OF SAID METAL IN A MOLTEN SALT WHICH IS ESSENTIALLY INERT TO SAID METAL, PLACING THE SUSPENSION IN A HIGH FREQUENCY ELECTROMAGNETIC FIELD AND HEATING ONLY THE METAL TO A TEMPERATURE OF AT LEAST 1100* C., REMOVING THE SUSPENSION FROM SAID HIGH FREQUENCY FIELD, SEPARATING THE SPONGE METAL FROM THE MOLTEN SALT, COOLING SAID SPONGE METAL IN AN INERT ATMOSPHERE TO TEMPERATURES AT WHICH SAID METAL IS NON-REACTIVE WITH THE NORMAL ATMOSPHERE AND THEN RECOVERING THE TREATED METAL.
References Cited (Backward Citations)
US2732292A
Cited
US2743199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |