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. 08, 2008
Filed:
Mar. 28, 2006
Applicants:
Masayuki Shibata, Tokyo, JP;
Osamu Ochiai, Kanagawa, JP;
Yuji Nagai, Kanagawa, JP;
Hideo Maejima, Kanagawa, JP;
Inventors:
Masayuki Shibata, Tokyo, JP;
Osamu Ochiai, Kanagawa, JP;
Yuji Nagai, Kanagawa, JP;
Hideo Maejima, Kanagawa, JP;
Assignee:
Sony Corporation, , JP;
Primary Examiner:
Int. Cl.
CPC ...
G01B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A magnetic scale includes a pipe and a polarizable magnetic member closely attached to the inner surface of the pipe so as to extend in the longitudinal direction of the pipe. The magnetic member is formed with magnetic marks provided by a plurality of N poles and S poles alternately arranged in the longitudinal direction of the magnetic member. Accordingly, the magnetic member can be reliably protected to thereby improve its durability.