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. 17, 2004
Filed:
Jan. 08, 2002
Applicant:
Inventors:
Shinya Hasegawa, Ibaraki, JP;
Mikie Kanai, Moriguchi, JP;
Hideo Torii, Higashiosaka, JP;
Tetsuya Kamimoto, Hirakata, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/127 ; C03C 3/066 ;
U.S. Cl.
CPC ...
G11B 5/127 ; C03C 3/066 ;
Abstract
In order to provide a practically lead-free glass composition having a low softening point and an excellent water resistance for use in various parts of electronic equipment and a magnetic head using the same, a glass composition is provided, which contains 0.5 to 14 wt % of SiO , 3 to 15 wt % of B O , 4 to 22 wt % of ZnO, 55 to 90 wt % of Bi O , 0 to 4 wt % of Al O , 0 to 5 wt % of at least one selected from the group consisting of Li O, Na O and K O, and 0 to 15 wt % of at least one selected from the group consisting of MgO, CaO, SrO and BaO.