Patent US3743499A successfully refreshed from Google Patents.
US3743499A
Expired / Lapsed
US
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Method of enlarging the particle size of transition metal powder and carbides thereof
Assignee: Rederi Nordstjernan AB
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Filing: 1971-10-21
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Granted: 1973-07-03
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Expires: 1991-10-21
Abstract
Abstract THE PARTICLE SIZE OF TRANSISTION METAL POWDER SELECTED FORM THE GROUP CONSISTING OF TI, ZR, HF, V, NB, TA, CR, MO AND W IS ENLARGED BY HEATING SAID POWDER AT AN ELEVATED PARTICLE GROWTH-PROMOTING TEMPERATURE BY MIXING INTIIMATELY WITH THE POWDER A METAL DOPING ADDITIVE CONSISTING ESSENTIALLY OF A PARTICLE GROWTH-PROMOTING ELEMENT SELECTED FROM THE GROUP CONSISTING OF CU, AG, AU, FE, CO, NI, RU, RH, PD, OS, IR AND PT. CARBIDE PARTICLES OF THE TRANSISTION METALS CAN BE ENLARGED DURING THE CARBURIZATION OF TH TRANSISTION METAL AT ELEVATED TEMPERATURES IN EXCESS OF 1000*C. AT WHICH THE TRANSITION METAL REACTS WITH CARBON TO FORM THE CARBIDE.
Inventors
- 👤 L Ramqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:55
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/14; B22F1/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |