US3917896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction melting furnace
Assignee: National Institute for Materials Science
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Filing: 1974-09-13
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Granted: 1975-11-04
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Expires: 1994-09-13
Abstract
Abstract An induction melting furnace for melting metals or alloys including an auxiliary induction heating coil in a material charging part. The material charging part is additionally heated to promote dissolving of the material in molten metal.
Inventors
- 👤 Ryuichi Nakagawa
- 👤 Shiro Yoshimatsu
- 👤 Akira Fukuzawa
- 👤 Akira Sato
- 👤 Tatsuro Mitsui
- 👤 Takuya Ueda
- 👤 Tsuyoshi Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:35
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
An induction melting furnace for melting a furnace charge, comprising: a material charging section; a main melting section equipped with a first induction coil for melting the furnace charge by induction heating; a molten metal effluent section; an auxiliary induction coil for promoting melting of the material by additional heating of the material and molten metal at the material charging section, said auxiliary coil including a change-over device supplying monophase alternating current to said coil to exert upwardly and downwardly directed forces on the material and molten metal in the material charging section by virtue of a pinch effect and said change-over device supplying upwardly and downwardly directed forces on the material and molten metal by virtue of a progressive magnetic field impressed thereon; and a control system for controlling the flow rate of the molten metal effluent, wherein said system incorporates a device for detecting the flow rate of the molten metal effluent, a device for detecting the liquid level of the material charging section and means for regulating electric power supplied to the auxiliary induction coil and, further, wherein said regulating means is operated by signals from the flow rate detecting devices and the liquid level detecting device.
Claim 2
Dependent Claim
200 words
An induction melting furnace for melting a furnace charge, comprising: a material charging section; a main melting section equipped with a first induction coil for melting the furnace charge by induction heating; a molten metal effluent section; an auxiliary induction coil for promoting melting of the material by additional heating of the material and molten metal at the material charging section, said auxiliary coil including a change-over device supplying monophase alternating current to said coil to exert upwardly and downwardly directed forces on the material and molten metal in the material charging section by virtue of a pinch effect and said change-over device supplying upwardly and downwardly directed forces on the material and molten metal by virtue of a progressive magnetic field impressed thereon; and a control system for controlling the flow rate of the molten metal effluent, wherein said system incorporates a device for detecting the flow rate of the molten metal effluent, a device for detecting the liquid level of the material charging section and means for regulating electric power supplied to the auxiliary induction coil and, further, wherein said regulating means is operated by signals from the flow rate detecting devices and the liquid level detecting device.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |