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:
Jul. 22, 2025
Filed:
Mar. 21, 2024
Niterra Co., Ltd., Nagoya, JP;
Ayato Kawabe, Nagoya, JP;
Haruki Yoshida, Nagoya, JP;
Kengo Fujimura, Nagoya, JP;
Takeshi Sakuma, Nagoya, JP;
Niterra Co., Ltd., Nagoya, JP;
Abstract
A spark plug includes a sealing material disposed around a center electrode in an insulator. On a cross section including a center line of an axial hole, one of long sides of a rectangle is set into the insulator along the center line. The rectangle is divided into 20 equal regions in the insulator by dividing each of short sides of the rectangle into two equal parts and dividing each of the long sides of the rectangle into 10 equal parts. The rectangle has a porosity of 5% or less. Among pores that appear in each of the regions, 10 pores having largest areas are selected as specific pores. The specific pores have an average area of 26.3 μmor less. The specific pores include no more than 30 pores having areas of 37 μmor more and no less than eight pores having areas of 51 μmor more.