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:
Aug. 28, 1990
Filed:
Nov. 30, 1988
Akira Torisawa, Machida, JP;
Katsumi Yoshida, Chichibu, JP;
Hiroshi Koizumi, Hanno, JP;
Hiroyuki Yoshikawa, Chichibu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Canon Denshi Kabushiki Kaisha, Saitanam, JP;
Abstract
A stepping motor characterized by the provision of an anisotropic resin magnet rotor which is the rotor of the motor and comprises an anisotropic resin magnet and which has recesses formed at the centers of the magnetic poles thereof and in which the wave form of the magnetic force is one of a two-head wave form and a trapezoidal wave form in the range of 0.1-0.2 of the air gap between the rotor and stator teeth during the use of the motor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile