US3732091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing mutual dispersions of carbides and metals or alloys and novel products thereof
Assignee: Bpifrance Financement SA
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Filing: 1970-07-01
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Granted: 1973-05-08
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Expires: 1990-07-01
Abstract
Abstract A MIXED OXIDE, A CO-PRECIPITATE OF HYDROXIDES OR A MIXED COMPLEX OF A FIRST METAL PROVIDING THE CARBIDE OF THE DISPERSION AND OF A SECOND METAL PROVIDING THE METAL OF THE DISPERSION ARE SUBJECTED TO A HEAT TREATMENT IN AN ENCLOSURE. THE COMPOUND THUS OBTAINED IS SUBJECTED, IN A REDUCING AND CARBURIZING ATMOSPHERE CONTAINING HYDROGEN AND METHANE, TO THERMAL TREATMENT BELOW 1100*C. TO REDUCE ALL THE OXIDES AND CARBURIZE THE FIRST METAL. HEATING IS EFFECTED AT A SPEED OF 100 TO 400*C./HOUR. THE DISPERSIONS COMPRISES PARTICLES OF SINGLE OR MIXED CARBIDES UNIFORMLY DISTRIBUTED IN THE MIDST OF ELEMENTARY GRAINS OF METAL. THE DISPRSIONS ARE USED IN POWDER METALLURGY.
Inventors
- 👤 R Paris
- 👤 D Thibaudon
- 👤 M Roubin
- 👤 J Paris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:54
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/053; C01; C01B; C01B32/00; C01B32/90; C01B32/907; C22C1/10; C22C1/1026; C01P; C01P2002/00; C01P2002/50; C01P2002/70; C01P2002/77; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |