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:
Dec. 31, 2019
Filed:
May. 27, 2016
Form Roll Tech Co., Ltd., Ohtsuki-shi, Yamanashi, JP;
FORM ROLL TECH CO., LTD., Ohtsuki-shi, JP;
Abstract
The dual-threaded screw structurehas a first thread (S) and a second thread (S) with various leads formed on the dual-thread portion and has a function of preventing loosening without insufficiency in strength of the dual-thread portion. This dual-thread portion is composed of a first thread (S) consisting of a coarse thread with a standard pitch P and a specific second thread (S). The second thread (S) is formed continuously on the thread ridge of the first thread (S). The second thread (S) has a sectional shape of this thread groove same as or substantially same as the first thread (S), has a same twisting direction as the first thread (S) and is a multi-threaded thread having threads with a triangular sectional shape and having a lead (L=n*P) a determined number (n)-times of a standard pitch P.