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:
Oct. 07, 1986
Filed:
Jul. 22, 1985
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
361414 ; 174 685 ; 361397 ; 361409 ;
Abstract
In a multilayer printed circuit board including a signal layer, a power supply layer, and through-holes, the shape of each of clearances formed on a power supply layer for the purpose of attaining insulation from through-holes is nearly a quadrangle having four circular corners. Thereby, the area of the power supply layer left between adjacent clearances is increased to suppress increase in electrical resistance at that portion.