US2529778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making tungsten monocarbide from tungsten-containing material
Assignee: Kennametal Inc
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Filing: 1949-01-12
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Granted: 1950-11-14
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Expires: 1969-01-12
Abstract
No abstract record available.
Inventors
- 👤 Philip M Mckenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
THE PROCESS OF PRODUCING TUNGSTEN MONOCARBIDE (WC) FROM TUNGSTEN-CONTAINING MATERIAL COMPRISING THE PREPARATION OF A CHARGE CONTAINING THE SAID MATERIAL, SILICON AND CARBON, HEATING THE CHARGE OF A TEMPERATURE ABOVE 2000*C. TO CAUSE CARBON TO COMBINE WITH TUNGSTEN TO FORM TUNGSTEN CARBIDE AND SILICON TO COMBINE WITH OTHER METALS IN THE CHARGE TO FORM SILICIDES THEREBY PREVENTING THE FORMATION OF INSOLUBLE INTERMETALLIC COMPOUNDS WITH TUNGSTEN, COOOLING THE RESULTING REGULUS, LEACHING THE REGULUS MATERIAL WITH ACID TO REMOVE THE ACID-SOLUBLE PORTION THEREOF, AND SUBJECTING THE REMAINING UNDISSOLVED PORTION TO GRAVITY SEPARATION TO SEPARATE A LIGHT PORTION, RELATIVELY LOW IN DENSITY, CONTAINING THE SILICIDES FROM A HEAVY PORTION, RELATIVELY HIGH IN DENSITY, THE HEAVY PORTION CONSISTING SUBSTANTIALLY OF TUNGSTEN MONOCARBIDE (WC).
Claim 2
Dependent Claim
119 words
THE PROCESS OF PRODUCING TUNGSTEN MONOCARBIDE (WC) FROM TUNGSTEN-CONTAINING MATERIAL COMPRISING THE PREPARATION OF A CHARGE CONTAINING THE SAID MATERIAL, SILICON AND CARBON, HEATING THE CHARGE OF A TEMPERATURE ABOVE 2000*C. TO CAUSE CARBON TO COMBINE WITH TUNGSTEN TO FORM TUNGSTEN CARBIDE AND SILICON TO COMBINE WITH OTHER METALS IN THE CHARGE TO FORM SILICIDES THEREBY PREVENTING THE FORMATION OF INSOLUBLE INTERMETALLIC COMPOUNDS WITH TUNGSTEN, COOOLING THE RESULTING REGULUS, LEACHING THE REGULUS MATERIAL WITH ACID TO REMOVE THE ACID-SOLUBLE PORTION THEREOF, AND SUBJECTING THE REMAINING UNDISSOLVED PORTION TO GRAVITY SEPARATION TO SEPARATE A LIGHT PORTION, RELATIVELY LOW IN DENSITY, CONTAINING THE SILICIDES FROM A HEAVY PORTION, RELATIVELY HIGH IN DENSITY, THE HEAVY PORTION CONSISTING SUBSTANTIALLY OF TUNGSTEN MONOCARBIDE (WC).
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) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |