Appeal No. 2001-2349
Application No. 09/237,895
resistor. Claims 24 and 25 are illustrative of the claimed
invention, and they read as follows:
24. A spark plug with a built-in resistor, which comprises:
an insulator having an axially extending passing-through
hole;
a terminal metal fitting fixed within the passing-through
hole at an end thereof;
a center electrode fixed within the same passing-through-
hole at the other end thereof; and
a resistor provided between said terminal metal fitting and
said center electrode within said passing-through-hole, said
resistor comprising a resistor composition which is a mixture of
a glass material portion and an electrically conductive material
portion,
wherein at least one of said terminal metal fitting and said
center electrode is formed with a surface layer facing said
resistor, said surface layer being a metallic layer consisting
essentially of at least one selected from the group consisting of
Zn, Sn, Pb, Rh, Pd, Pt, Cu, Au, Sb and Ag, and a Ni alloy
comprising at least one of B and P,
wherein said at least one of said terminal metal fitting and
said center electrode is directly in contact with said resistor
on the surface of said metallic layer.
25. A spark plug with a built-in resistor, which comprises:
an insulator having an axially extending passing-through
hole;
a terminal metal fitting fixed within the passing-through
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