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. 05, 2003
Filed:
Oct. 24, 2001
Yoshihiko Yamaguchi, Okayama, JP;
Uchiyama Manufacturing Corp., Okayama, JP;
Abstract
An unvulcanized raw rubber is provided, to which magnetic ferrite powder is added. A resulting mixture composed of the unvulcanized raw rubber and magnetic ferrite powder is passed through a rolling machine or an extruding machine such that the mixture is formed into a sheet blank that contains the magnetic ferrite powder aligned regularly in a particular orientation. Alternatively, the resulting mixture may be first passed through an extruding machine and then through a rolling machine. The sheet blank is then stamped across a planar direction such that a ring-like sheet is formed. The ring-like sheet, along with a supplemental ring, is placed inside a metal mold, where the ring-like sheet and supplemental ring are compressed in an axial direction, while applying heat thereto, so that the ring-like sheet is vulcanized and joined to the supplemental ring. Finally, the vulcanized ring-like sheet is magnetized so that S poles and N poles appear alternately around its circumference.