Glow plug and spark plug, and manufacturing method therefor
US7122947B2 · kind B2 · utility
3Cited by
13References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2004 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Mar 18, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23Q2007/004
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a glow plug and a spark plug, the surface of a main metal shell is coated with a chromate film in which the quantity of trivalent chrome is 95 wt % or more of the contained chrome components and which has a thickness of 0.2 μm to 0.5 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.