METAL SHEATH GLOW PLUG
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United States of America Patent
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Issued Date -
Mar 11, 2010
app pub date -
Sep 8, 2008
filing date -
Sep 8, 2008
priority date (Note) -
Abandoned
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Abstract
A glow plug (10) which includes an annular metal shell (12), thermally conductive tubular sheath (20), electrode (22), resistance heating element (24), and electrically insulating, thermally conductive powder (26). A metallic seal (28) is disposed in an open end of the sheath (20) in sealing engagement with the electrode (22). An insulating layer (54) is formed on the outer surface of the electrode (22) so as to prevent electrical conductivity between the metal seal (28) and the electrode (22). An optional secondary metal layer (56) may be disposed between the insulating layer (54) and the metal seal (28).
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