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. 19, 2016
Filed:
Aug. 29, 2013
Citizen Holdings Co., Ltd., Nishitokyo-shi, Tokyo, JP;
Citizen Watch Co., Ltd., Nishitokyo-shi, Tokyo, JP;
Hitachi Metals, Ltd., Minato-ku, Tokyo, JP;
Neomax Materials Co., Ltd., Suita-shi, Osaka, JP;
Yoshirou Hirai, Sayama, JP;
Shinichi Matsumoto, Tokorozawa, JP;
Kenji Tsuchiya, Higashikurume, JP;
Shinji Yamamoto, Suita, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
CITIZEN WATCH CO., LTD., Tokyo, JP;
HITACHI METALS, LTD., Tokyo, JP;
HITACHI METALS NEOMATERIAL, LTD., Osaka, JP;
Abstract
A hairspring material for a mechanical timepiece includes an alloy which contains 37.5 to 39.5% by mass of Ni, 9.2 to 9.9% by mass of Cr, 0.35 to 0.55% by mass of Ti, and 0.6 to 0.9% by mass of Be, based on the total amount of the alloy, and contains in the remainder Fe and unavoidable impurities, the alloy being an alloy containing, as the unavoidable impurities, C (carbon), Mn in an amount of more than 0% by mass but not more than 0.5% by mass and Al in an amount of more than 0% by mass but less than 0.03% by mass, the amount of the C (carbon) being limited to not more than 0.03% by mass. The hairspring material can provide a smaller variation in Young's modulus than that of conventional hairspring materials.