IGNITION PLUG AND METHOD FOR MANUFACTURING A CENTER ELECTRODE FOR THE SAME
United States Patent 3548472
US Patent References:
Spark plug
- - 1488526

Spark plug
- - 2208030

Spark plug
- - 2415138

Spark plug
- - 2296033

Spark plug and method of making same
- - 2321840


Inventors:
Urushiwara, Hisashi
Morino, Hiroshi
Suzuki, Misao
Publication Date:
12/22/1970
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Assignee:
HITACHI LTD
Primary Class:
445/7
Other Classes:
313/141, 313/144, 313/136
International Classes:
H01T21/02; H01T21/00
US Patent References:
2360287Method of making spark plugs
2449403Spark plug electrode
2542903Spark plug and method of making same
2717438Spark plug with auxiliary gap
3356882Spark plug having the center electrode sheath with a nickel alloy
3452235SPARK PLUG HAVING A SHORT TIP CENTER ELECTRODE




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