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. 29, 1992
Filed:
Jan. 30, 1989
Applicant:
Inventors:
Kazuo Kondo, Aichi, JP;
Asao Morikawa, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
501 39 ; 501-5 ; 501-8 ; 501-9 ;
Abstract
A substrate having a low dielectric constant for use with electronic devices consisting essentially of porous crystalline glass. The composition of the crystalline glass is represented by the formula X-Al.sub.2 O.sub.3 -SiO.sub.2, where X is one or more of the metal oxides ZnO, MgO, Li.sub.2 O, ZrO.sub.2, B.sub.2 O.sub.3, P.sub.2 O.sub.5, Y.sub.2 O.sub.3 and BaO. The crystalline glass may also include a filler material such as a ceramic powder or non-glass material. The substrate initially has a particle size of approximately 5 microns or less, which provides a high mechanical strength to the substrate even at high porosities.