Method of making electric heating unit
US4073970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1976 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | May 4, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical cooking or heating unit comprising a plate of a glassy material including a selected portion thereof upon whose upper surface vessels are to be placed for cooking purposes. The lower surface of the selected portion of the plate is provided with at least one sinuous strip of a gold/platinum alloy which integrally forms the electrical resistance heating element for the heating or cooking unit. A porous and partially sintered overglaze or coating covers the heating element and the portion of the lower surface of the plate on which the heating element is provided, such glaze preventing or inhibiting cracking, peeling or agglomeration of the heating element to provide a resultant increase in electrical resistivity. The life of the heating or cooking unit is thereby substantially increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.