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:
Apr. 09, 1985
Filed:
Nov. 03, 1982
Robert E Braun, Norristown, PA (US);
John E Benasutti, North Wales, PA (US);
Burroughs Corporation, Detroit, MI (US);
Abstract
The present disclosure describes test coupons having predetermined respective test patterns, formed in a multilayer printed circuit board simultaneously with the fabrication of the latter. The test coupons are probed with conventional electrical instruments to provide information as to the occurrence of a misregistration of any given subsurface printed plane or trace, whether or not the misregistration exceeds a specified limit, and if desired, a measure of the degree of misregistration. The foregoing are readily accomplished in a time and cost efficient manner without the need for cross-sectioning portions of the board and the visual observation of the subsurface printed layers.