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:
Apr. 01, 2014
Filed:
Nov. 16, 2009
Yuetsu Murakami, Sendai, JP;
Koichiro Jujo, Chiba, JP;
Osamu Takahashi, Chiba, JP;
Jun Tsuneyoshi, Chiba, JP;
Ryo Sugawara, Chiba, JP;
Takeshi Takano, Iwate, JP;
Yuetsu Murakami, Sendai, JP;
Koichiro Jujo, Chiba, JP;
Osamu Takahashi, Chiba, JP;
Jun Tsuneyoshi, Chiba, JP;
Ryo Sugawara, Chiba, JP;
Takeshi Takano, Iwate, JP;
The Foundation: The Research Institute for Electric and Magnetic Materials, Sendai-Shi, JP;
Seiko Instruments Inc., Chiba-Shi, JP;
Abstract
A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. The alloy consists of Co, Ni, Cr, Mo. and Fe. The alloy is healed and cooled before being subjected to repeated wiredrawing and intermediate annealing, forming a wire with a fiber structure having a <111> fiber axis. The wire is then cold rolled into a sheet and heated to obtain optimal magnetic insensitivity and hardness.