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:
Sep. 05, 2017
Filed:
Jul. 08, 2014
Topura Co., Ltd., Hadano-shi, Kanagawa, JP;
Shigeto Mori, Hadano, JP;
Hiroshi Nakano, Hadano, JP;
Yosuke Okamura, Hadano, JP;
Seiya Hoshino, Hadano, JP;
TOPURA CO., LTD., Hadano-shi, Kanagawa, JP;
Abstract
A threaded fastener is provided in which a head bearing surface can be in full intimate contact with a counterpart. The threaded fastener is provided with a head (), and a screw shank () extending from the head (). The screw shank () is provided with a parallel thread portion () having a complete screw thread formed therein, a neck portion () having no screw thread, a transition thread portion () having an incomplete screw thread formed to extend from the parallel thread portion () toward the neck portion () with its root diameter being the same as that of the complete screw thread and with its thread height gradually becoming lower to reach the neck portion, and an underneck rounded portion () formed in a corner angle portion between the neck portion () and a head bearing surface (), wherein the neck portion () is work hardened with its diameter being narrowed from a root diameter of the parallel thread portion ().