Method for manufacturing a ceramic heater
US4640809A · kind A · utility
4Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1984 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | May 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/027
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method of making a ceramic heater by preparing a heating coil having a circular cross-section and bending it into a U-shaped form. Lead wires are connected to the ends of the U-shaped coil; the coil is embedded in a ceramic powder to form a preform having a substantially rectangular cross-section. The preform is compacted under heat to reduce the length of the rectangular cross-section and deform the coil embedded therein into a coil having an oval cross-section. The preform is sintered to form a ceramic product having a substantially circular cross-section and then ground to form a product having a circular cross-section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.