发明授权
- 专利标题： Glow plug and spark plug, and manufacturing method therefor
- 专利标题（中）： 辉光插头和火花塞及其制造方法
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申请号： US10176004申请日： 2002-06-21
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公开(公告)号： US06791245B2公开(公告)日： 2004-09-14
- 发明人: Hiroaki Nasu , Wataru Matsutani , Chiaki Kumada , Katsunari Ninomiya
- 申请人： Hiroaki Nasu , Wataru Matsutani , Chiaki Kumada , Katsunari Ninomiya
- 优先权： JP11/49018 19990225; JP11/49019 19990225
- 主分类号： H01T1320
- IPC分类号： H01T1320
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 &mgr;m to 0.5 &mgr;m.
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