Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load
Patent
1975-04-30
1977-01-18
Kominski, John
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Discharge device load
174152S, 252518, 338 66, H01T 116
Patent
active
040041832
ABSTRACT:
A resistor built-in spark plug comprising an insulator formed therein with an axially extending bore, a terminal nut fitted in an upper end portion of the bore, a center electrode fitted in a lower end portion of the bore, a resistor arranged in a central portion of the bore, one copper-glass electrode interposed between the resistor and the terminal nut, and another copper-glass electrode interposed between the resistor and the center electrode, such resistor being made by firing (calcining) and solidifying a resistor powder mixture consisting of 30 to 10 volume % of a principal resistor component containing tin oxide, 35 to 85 volume % of insulating ceramic filler powder of a higher electric resistivity than the principal resistor component which is selected from the group consisting of quartz glass, alumina, zircon, zirconia, silica (SiO.sub.2) and .beta.-spodumene, and 35 to 5 volume % of glass powder having a softening temperature in a range between 300.degree. and 600.degree. C. One or both of the two copper-glass electrodes may consist of two electrode layers, one copper-glass layer maintained in contact wth the resistor and having a higher copper content than the other copper-glass electrode layer.
REFERENCES:
patent: 2371211 (1945-03-01), Barrington
patent: 2459282 (1949-01-01), McDougal et al.
patent: 2864884 (1958-12-01), Counts et al.
patent: 3452235 (1969-06-01), Hallauer et al.
Kamigaito Osami
Masaki Hideyuki
Nakamura Yasuo
Oki Masami
Suzuki Masatoshi
Kabushiki Kaisha Toyota Chuo Kenkyusho
Kominski John
Nippondenso Co. Ltd.
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