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:
Nov. 05, 2013
Filed:
Nov. 20, 2008
Hiroyuki Kameda, Aichi, JP;
Hiroyuki Kameda, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A corner of a distal end of a ground-electrode-side noble metal tip of a spark plug is taken as a first corner; a corner of a leading end of a center-electrode-side noble metal tip is taken as a second corner; a corner formed at a starting point where a diameter of the center electrode is reduced is taken as a third corner; a corner of the ground electrode is taken as a fourth corner; a corner closest to the third corner of the corners on the distal end of the ground-electrode-side noble metal tip is taken as a fifth corner; a length of a virtual flying spark path defined between the first corner and the second corner is taken as L; a length of a virtual flying spark path defined between the third corner and the fourth corner is taken as L; a length of a virtual flying spark path defined between the third corner and the fifth corner is taken as L; and Lor L, whichever is shorter, is taken as L, the spark plug fulfills a relational expression of L/L≧1.1.