US3582528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment process
Assignee: Stanelco Thermatron Ltd
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Filing: 1969-05-08
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Granted: 1971-06-01
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Expires: 1989-05-08
Abstract
Abstract This invention relates to that method of processing charges of electrically conducting or semiconducting material by fusing the charge in a crucible by means of induction heating effects induced in the charge by a working coil surrounding the crucible. The invention is characterized in that the crucible is provided with a pouring aperture in the base thereof and that the charge is supported above the pouring aperture in the crucible at least during the fusing thereof by means of electromagnetic forces induced in the charge by the working coil. Preferably the crucible is a liquid-cooled crucible of an electrically conducting material (i.e. is fabricated from a cage of watercooled copper tubes).
Inventors
- 👤 Allen Gordon Seale
- 👤 Robert Charles Vasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/32; Y; Y10; Y10S; Y10S117/00; Y10S117/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
A method as claimed in claim 1, in which the crucible is a liquid-cooled crucible of an electrically conducting material.
Claim 2
Dependent Claim
20 words
A method as claimed in claim 2, in which the crucible is fabricated from a cage of water-cooled copper tubes.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 3, in which the cage of tubes is of diabolo shape with the pouring aperture located at the narrowest part of the crucible.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1, in which the crucible is housed in an air-impermeable container which also encloses a mold below the crucible to receive the poured charge.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |