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:
Nov. 24, 1987
Filed:
Nov. 14, 1985
Toshinori Fujii, Sakai, JP;
Shinji Okamoto, Yawata, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A method for drilling reference holes in a multi-layer printed wiring board assembly, in which drilling position marks provided on inner-layer circuit board in the assembly are roughly detected through each of two outer-layer boards of the assembly, a spot-facing is made with respect to the outer-layer boards at roughly detected points of the marks, and thereafter the marks are precisely detected at the faced spots. Positions for drilling the reference holes can be thereby determined at the spots precisely in close proximity to the internally provided drilling position marks, to allow the drilling performed very accurately in simpler and economical manner.