The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2024
Filed:
Jun. 06, 2022
Niterra Co., Ltd., Nagoya, JP;
Susumu Imai, Nagoya, JP;
Tatsuya Gozawa, Nagoya, JP;
Niterra Co., Ltd., Nagoya, JP;
Abstract
A spark plug includes an insulator having an axial hole, a center electrode disposed in the axial hole and having a forward end portion projecting to a forward end of the axial hole, a tubular metallic shell which holds the insulator on its inner circumference and has a screw portion formed on its outer circumferential surface, and a ground electrode whose first end portion is fixed to a through hole provided in the metallic shell and whose second end portion forms a discharge gap between the second end portion and the forward end portion. The screw portion has a first screw portion located on a rear end of the through hole and a second screw portion located on a forward end of the through hole, and the first screw portion has a pitch diameter larger than that of the second screw portion.