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:
May. 03, 1988
Filed:
Jan. 12, 1987
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ; C04B / ;
U.S. Cl.
CPC ...
252 626 ; 252 6258 ; 252 6259 ; 501 32 ; 501 46 ;
Abstract
The glass composition is particularly applicable for ferrite constituents used for a highly efficient magnetic head. The composition essentially consists of (a) 55-70 wt % of V.sub.2 O.sub.5, (b) 18-wt % of P.sub.2 O.sub.5, (c1) up to 10 wt % of at least one alkaline metal oxide selected from Na.sub.2 O, K.sub.2 O, Rb.sub.2 O, and Cs.sub.2 O and (c3) up to 10 wt % of Tl.sub.2 O. The composition is in a non-crystalline state during reheating and has a softening temperature of 310.degree. C.-400.degree. C. and a thermal expansion coefficient of 70-130.times.10.sup.-7 /.degree.C.