Spark plug with a wide discharge gap
US4439707A · kind A · utility
23Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1981 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jul 22, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug with a wide discharge gap includes an insulating layer formed on one or the other of its center and ground electrodes and disposed in the gap between the electrodes. The insulating layer includes an inner insulating layer of a material having a high dielectric constant and an outer insulating layer of a material having an excellent resistance to heat and high voltage, which surrounds the inner insulating layer, whereby ensuring a reduced discharge voltage, an improved ignition performance and improved heat resistance and durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.