Method for manufacturing spark plug
US10008834B2 · kind B2 · utility
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4Claims
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Key dates
| Filing date | Jul 20, 2016 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Jul 20, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a spark plug comprising the steps of: placing an assembly of the center electrode, an insulator, and a metal shell in a pressure resistant vessel and determining whether or not the insulator has a defect by applying a voltage to the center electrode, and bending the ground electrode toward the center electrode after the defect inspection step, the defect inspection step being performed while a pressure in the pressure resistant vessel is changed to a plurality of different pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.