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. 20, 1993
Filed:
Dec. 18, 1991
Yasuo Mizuno, Hirakata, JP;
Masaki Ikeda, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The invention relates to crystallized glass that can be used with various electronic components such as magnetic heads and the like as bonding or sealing glass. This crystallized glass comprises, in % by weight, at least 11-17% of SiO.sub.2, 7-10% of B.sub.2 O.sub.3, 30-55% of PbO, 1-3% of CdO, 5-10% of A.sub.2 O (A stands for a kind of alkali metal), 7-35% of ZnO and 0-10% of ZrO.sub.2 with the sum of ZnO and ZrO.sub.2 not exceeding 35%, and has the characteristics of 550.degree.-600.degree. C. as the working temperature, (80-100).times.10.sup.-7 /.degree.C. as the thermal expansion coefficient, 550.degree. C. or more as the thermal expansion coefficient, and 550.degree. C. or more as the glass transition point after working.