Self-sealing thermally sensitive resistor and method of making same
US4452726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1981 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Aug 20, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49099
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A thick film cermet thermistor having a low to moderate electrical resistivity but high resistance to abrasion and humidity is disclosed. The thermistor composition has a sintering aid and a sealing glass that soften at significantly different temperatures. The thermistor film is sintered after application to a substrate predominantly between the two softening point temperatures. Sintering temperature is raised above the higher softening point temperature long enough to glaze the thick film and bond it to the substrate but not long enough to substantially increase film resistance. A composition is disclosed that can be sintered under the same firing conditions for resistor and conductor films, permitting one firing to be used to sinter all three types of films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.