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. 12, 2013
Filed:
Jul. 07, 2010
Yukihiko Sugawara, Souka, JP;
Masakazu Hayashi, Tokyo, JP;
Yukihiko Sugawara, Souka, JP;
Masakazu Hayashi, Tokyo, JP;
Tokyo Byokane Co., Ltd., Tokyo, JP;
Natec Co., Inc., Saitama, JP;
Abstract
A self-tapping screw includes a screw shaft extended downward from a screw head, plural flights of constant-height external thread respectively having the same flight height formed at a part of the screw shaft extended right below the screw head, and plural flights of low-height external thread having flight height decreased gradually toward an end face of a shaft tip portion formed continuously with the constant-height external thread at the shaft tip portion of the screw shaft. A slight arc face is formed continuously at respective connecting parts of upper and lower flanks with upper and lower root faces of the low-height external thread, and the slight arc face is formed so as to extend at least along a connecting part of a lower flank and a lower root face of a constant-height external thread end flight continuing to the low-height external thread.