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:
Jun. 01, 2004
Filed:
Nov. 01, 2001
Applicant:
Inventors:
Hideyuki Harada, Omihachiman, JP;
Hirofumi Sunahara, Moriyama, JP;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/126 ; H05K 3/46 ;
U.S. Cl.
CPC ...
B32B 3/126 ; H05K 3/46 ;
Abstract
In a ceramic green-sheet stack to be fired to form a multilayered ceramic substrate having a cavity, a shrinkage-reducing pad is formed along a boundary interface between first ceramic green sheets having an opening for defining a cavity, and second ceramic green sheets having no opening. The shrinkage-reducing pad is exposed on the entire periphery of the inner peripheral surface of the cavity at the bottom end of the inner peripheral surface. The shrinkage-reducing pad contains a glass component, and serves to reduce shrinkage stress produced at the boundary interface between the first and second ceramic green sheets during the firing process.