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Hole Cleaning Disclosure Number: IPCOM000070105D
Original Publication Date: 1978-Aug-01
Included in the Prior Art Database: 2005-Feb-21

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Howrilka, F Lo, JC [+details]


A laser can be used to drill a blind via 30 in an epoxy substrate 20. The laser drills through the epoxy 20 but not through the copper foil 10. The laser drilling operation produces debris in the bottom of the hole which must be cleaned.