Cylindrical varistor and method of making the same
US4069465A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Jul 12, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49101
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A varistor has a cylindrical core made of a sintered varistor material which includes a longitudinal opening between the core ends. A pair of terminating layers are applied to the core, each adhering to one of the ends of the core and being in electrical contact with a lead wire inserted into the longitudinal opening. An electrode film is applied to the outer longitudinal surface of the core with each end in communication with one of the terminating layers. The electrode film is divided between the terminating layers into a pair of electrode portions by a gap which is dimensioned to predetermine the electrical properties of the varistor. The preferred method of manufacture involves forming a sintered, cylindrical core of varistor material with a longitudinal opening; applying a terminating layer to each end of the core; applying an electrode film to the core surface with each end of the core in contact with one of the terminating layers; dividing the film into a pair of electrode portions by forming a gap between the ends of the film; and inserting a lead wire into each end of the core opening in contact with one of the terminating layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.