US 12,407,148 B2
Spark plug
Kaito Nakamura, Nagoya (JP); Daisuke Sumoyama, Nagoya (JP); Takaaki Kikai, Nagoya (JP); and Kengo Hattori, Nagoya (JP)
Assigned to NITERRA CO, LTD., Nagoya (JP)
Appl. No. 18/571,546
Filed by Niterra Co., Ltd., Nagoya (JP)
PCT Filed Jul. 12, 2022, PCT No. PCT/JP2022/027443
§ 371(c)(1), (2) Date Dec. 18, 2023,
PCT Pub. No. WO2023/013371, PCT Pub. Date Feb. 9, 2023.
Claims priority of application No. 2021-126835 (JP), filed on Aug. 2, 2021.
Prior Publication US 2024/0291244 A1, Aug. 29, 2024
Int. Cl. H01T 13/39 (2006.01)
CPC H01T 13/39 (2013.01) 3 Claims
OG exemplary drawing
 
1. A spark plug comprising:
a center electrode including a base material and a discharge member at a tip of the base material, the discharge member covering a front end of the tip of the base material; and
a ground electrode opposed to the discharge member with a spark gap therebetween, wherein
the discharge member contains Ru as a main component, and not lower than 0.5% by mass and not higher than 30% by mass of Ni or Co.