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:
Feb. 11, 2020
Filed:
Nov. 28, 2016
Usui Co., Ltd., Shimizu-cho, Sunto-gun, Shizuoka, JP;
Hiroaki Kondo, Shimizu-cho, JP;
Akio Tagami, Shimizu-cho, JP;
USUI CO., LTD., , JP;
Abstract
Provided is a high-pressure fuel injection pipe with a connection head which achieves an improvement in outer-surface cleanliness and prevention of a decrease in axial force and fastening strength. The pipe having, at a connection end of a narrow-diameter thick-wall steel pipe having a rust-inhibiting coating applied to an outer surface of the pipe, the connection head composed of a spherically-shaped seat surface, an annular flange, and a conical surface and having an outside peripheral surface forming formed into seat surface in a truncated conical shape or truncated arc shape for a mating seat; and a washer fitting in a neck lower part of the connection head and having a rust-inhibiting coating applied to an outer surface of the washer, wherein a contact part between the neck lower part of the connection head and an end part of the washer has a metal-to-metal contact structure without having the rust-inhibiting coating.