Heater equipped spark plug

Details Heater equipped spark plug Heater equipped spark plug

1995-12-12

2000-05-09

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313137, 313143, 445 7, 123169EL, 123169PB, H01T 1320, H01T 2102, F02P 100

Patent

active

060608218

ABSTRACT:
A heater-equipped spark plug comprises an insulator having an insulator nose which holds thereon a center electrode in the vicinity of a free end of an axial bore, a lead wire arranged along a surface of the insulator, a heater formed on the insulator nose by baking a metal paste and connected to the lead wire; and a high softening-point glass layer covering and holding the heater in place with an alumina layer interposed between the high softening-point glass and the heater. Preferably, the alumina layer can have a thickness of 20-200 .mu.m and the high softening-point glass layer can have a thickness of 30-500 .mu.m.

REFERENCES:
patent: 1799225 (1931-04-01), Gerdien et al.
patent: 3365605 (1968-01-01), Linstedt
patent: 3680538 (1972-08-01), Scherenberg
patent: 4267483 (1981-05-01), Nakajima et al.
patent: 4914344 (1990-04-01), Watanabe et al.

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