Spark plug and its manufacturing method
US6885135B2 · kind B2 · utility
23Cited by
9References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Mar 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Noble metallic tips, made of a Pt alloy or an Ir alloy, are fixed to electrode base materials. The electrode base materials are an alloy containing a chief element selected from the group consisting of Ni, Fe, and Co and a plurality of additive elements. At least two kinds of additive elements contained in this alloy have a standard free energy of formation smaller than that of the chief element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.