Zirconia induction furnace
Patent 4450333 Issued on May 22, 1984. Estimated Expiration Date: 
May 28, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 28, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3362803 3401227 3404973 3916047 Container for evaporation of metal Heat resistant crucible 4090851 Refractories and methods of making same Crucible Silicon melting crucible Patent #: 4356152 InventorsAssigneeApplicationNo. 06/383386 filed on 05/28/1982US Classes:65/509, Electric or electromagnetic heating utilized (e.g., induction heat, etc.)219/649, Materials373/139, Zone melting373/155, Lining432/248, Protected, lined or reinforced melt holding section432/264, Lined, layered or coated65/374.13, Ceramic material65/416, Consolidation in situ (e.g., sintering, etc.)65/425, Electromagnetic, magnetic, wave, or particulate energy utilized65/435, With fiber stretching, drawing, or pulling (e.g., from rod, etc.)65/533With drawing meansExaminersPrimary: Envall, Roy N. Jr.Assistant: Leung, Philip H. Attorney, Agent or FirmInternational ClassesH05B 6/02 (20060101)C03B 37/02 (20060101) C03B 37/029 (20060101) AbstractA high frequency induction furnace (10) for reflowing a portion of a lightguide preform (44) in order to draw a fiber (52) therefrom. The furnace (10) has a centrally located tubular susceptor (34) therein having a thin coating of the preform material (e.g., silica) on at least a portion of the inside surface thereof. A cylinder (62) is positioned in concentric, spaced relation about the susceptor (34) and is surrounded by an insulating grain (36). A high frequency coil (38) is energized to couple its electromagnetic field to the susceptor (34) to heat and reflow a portion of the preform (44) in order to draw the fiber (52) therefrom. The thin coating prevents contaminating particulates from migrating from small cracks in the inside surface of the susceptor (34) onto the preform (44) while the cylinder (62) prevents small particulate emanating from the insulating grain (36) from being drawn through larger cracks in the susceptor and onto the preform and/or the fiber 52.Other References
| |
