Resistor device and method of making
US4189509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1976 |
| Grant date | Feb 19, 1980 |
| Priority date | — |
| Expiry date | Sep 9, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49101
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved electrical resistor device is made by molding a body of ceramic material of positive temperature coefficient of resistivity so that a plurality of passages extend in a pattern in spaced side-by-side relation to each other between opposite ends of the body. In molding the body, lands or abutments of resistor material are formed around the ends of alternate body passages at one end of the body and similar lands or abutments are formed around the ends of the other passages at the opposite end of the body. A band of masking material is applied to the sides of the body extending around the body leaving the ends of the body, and bands of the body side surface adjacent each end of the body, free of masking material. The masked body is then immersed in a coating bath for simultaneously coating the inner walls of the body passages, the ends of the body, and the unmasked bands of the body side surface with an electrically conductive ohmic contact material. Preferably, the ohmic contact and masking materials are selected to be impervious to reducing atmospheres and the like for protecting masked and coated portions of the ceramic resistor material against degradation in such atmos…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.