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US 11,309,689 B2Granted
Spark plug and method for manufacturing spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorJunji Kimura
Life of this patent
Estimating the term…
Abstract
A spark plug including an insulator and a metallic member such as a metallic shell. In the spark plug, a mark such as a two-dimensional code is provided on the surface of at least one of the insulator and the metallic member. Also, a protective layer covers the mark. The protective layer is optically transparent and contains a fluorescent substance.
Claims4
A spark plug comprising:
- an insulator;
- a metallic member;
- a mark provided on a surface of at least one of the insulator and the metallic member;
- and
- a protective layer which covers the mark,
- wherein the protective layer is optically transparent and contains a fluorescent substance.
3 more elements
A method for manufacturing a spark plug including an insulator and a metallic member and having a mark on a surface of at least one of the insulator and the metallic member, the method comprising:
- a mark forming step of forming the mark;
- and
- a protective layer forming step of forming a protective layer containing a fluorescent substance which covers the mark.
Dependencies are inferred from the claim text.