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. 12, 2011
Filed:
Jun. 12, 2006
Tetsuya Asai, Wako, JP;
Yoshihiro Takitani, Wako, JP;
Katsuhiro Tsukiyama, Yokohama, JP;
Takehiko Egawa, Yokohama, JP;
Tetsuya Asai, Wako, JP;
Yoshihiro Takitani, Wako, JP;
Katsuhiro Tsukiyama, Yokohama, JP;
Takehiko Egawa, Yokohama, JP;
Saga Tekkohsho Co., Ltd., Saga, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
There is provided a screw treated by a chemical conversion coating of trivalent chromium having a torque characteristic approximately equivalent to a screw of a hexavalent chromate treatment. For the purpose, on a surface of a bolt, a zinc plating layer is formed by a zinc plating treatment. On the layer, a chemical conversion coating of trivalent chromium is also formed by a treatment of chemical conversion coatings of trivalent chromium. The coating is formed to be thin and soft so that the zinc-based plating layer can be exposed on the surface due to rubbing off of the chemical conversion coating of trivalent chromium at a contact portion to a fastened member of the bolt by tightening the bolt.