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:
Dec. 28, 1993
Filed:
Jun. 24, 1992
Masanobu Yamazaki, Mooka, JP;
Kazumi Noguchi, Saitama, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A bonding glass for assembling a magnetic head by bonding a magnetic core to a non-magnetic ceramic slider. The magnetic core has a gap and an Fe-Al-Si film within the gap. The bonding glass includes SiO.sub.2 in the range of 6 to 11 wt %, B.sub.2 O.sub.3 in the range of 5 to 9 wt %, Al.sub.2 O.sub.3 in the range of 2 to 5 wt %, PbO in the range of 55 to 70 wt %, Bi.sub.2 O.sub.3 in the range of 5 to 15 wt %, TeO.sub.2 in the range of 1 to 10 wt % and CuO in the range of 0.5 to 2 wt %. A part of the PbO in PbO-SiO.sub.2 -B.sub.2 O.sub.3 -Al.sub.2 O.sub.3 glass is replaced with TeO.sub.2 and Bi.sub.2 O.sub.3 and, at the same time, CuO is added in order to prevent the formation of a heterophase. Glass color change under high temperature and high humidity is prevented.