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:
Aug. 23, 1983
Filed:
Aug. 06, 1981
James R Bupp, Endwell, NY (US);
Lawrence R Maier, Johnson City, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method of detecting flaws in a printed circuit board laminate having drilled holes wherein a penetrating solution containing a UV fluorescing dye is applied to the laminate to fill the drilled holes and flaws. Excess penetrating solution is removed from the drilled holes and the surface of the laminate. The penetrating solution remaining in the flaws is cured into an insoluble solid and then the laminate is cross-sectioned to provide at least one sample carrying the cured solution. The sample is encapsulated in a clear epoxy and the encapsulated sample is ground and polished to provide a surface which is examined under UV light.