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. 04, 1992
Filed:
Nov. 20, 1990
Applicant:
Inventors:
Kenji Makino, Yokohama, JP;
Fujihiro Ito, Tsurugashimacho, JP;
Yutaka Kusano, Yokohama, JP;
Toru Matsuda, Yokohama, JP;
Shin'ichi Inoue, Fukaya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360126 ;
Abstract
A magnetic head having a substrate, a magnetic core means including a magnetic thin film deposited on one surface of the substrate, and a protective plate formed on the magnetic thin layer in a way that the magnetic thin film is interposed between the protective plate and the substrate. At least a portion of the substrate, or of the protective plate or of the both substrate and protective plate is made by crystallized glass. The crystallized glass is obtained by thermally treating glass containing the following oxides on % by weight basis: