US3746584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the continuous vacuum decarbonization of low carbon ferrochrome
Assignee: JFE Engineering Corp
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Filing: 1971-02-09
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Granted: 1973-07-17
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Expires: 1991-02-09
Abstract
Abstract LOW CARBON FERROCHROME IS MANUFACTURED BY PREHEATING IN AN EVACUATED PREHEATING CHAMBER PARTICULES OF PARTIALLY OXIDIZED HIGH CARBON FERROCHROME BONDED TOGETHER BY A BONDING AGENT FOR REMOVING THE BONDING AGENT, DECARBONIZING THE PARTICLES AT AN ELEVATING TEMPERATURE IN AN EVACUATED DECARBONIZING CHAMBER AND COOLING CHAMBER TO A BONIZED PARTICLES IN AN EVACUATED COOLING CHAMBER TO A TEMPERATURE AT WHICH OXIDATION BY THE ATMOSPHERIC AIR DOES NOT OCCUR.
Inventors
- 👤 M Takeda
- 👤 T Banba
- 👤 T Nakajima
- 👤 K Takahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:18
CPC Classifications
C; C22; C22C; C22C3/00; C21; C21D; C21D3/00; C21D3/02; C21D3/04; C22C38/00; C22C38/18; B; B22; B22F; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 0
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |