Spark plug with specific metal shell coating
US6236148A · kind A · utility
10Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2000 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Feb 25, 2020 |
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 .mu.m to 0.5 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.