| 发明名称 |
Glow plug and spark plug, and manufacturing method therefor |
| 摘要 |
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 mum to 0.5 mum.
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| 申请公布号 |
US6437493(B2) |
申请公布日期 |
2002.08.20 |
| 申请号 |
US20010790655 |
申请日期 |
2001.02.23 |
| 申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
NASU HIROAKI;MATSUTANI WATARU;KUMADA CHIAKI;NINOMIYA KATSUNARI |
| 分类号 |
E04C3/36;E04F13/14;E04F19/00;F23Q7/00;H01T13/20;H01T13/39;H01T21/02;(IPC1-7):H01T13/20 |
主分类号 |
E04C3/36 |
| 代理机构 |
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