Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1986-02-03
1987-05-05
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
156634, 156656, 1566611, 427 97, H05K 100
Patent
active
046634975
ABSTRACT:
Feed-through vias (38) of 8 mil and smaller diameter are placed on 25 mil centers or smaller so that the feed-through vias serve only as electrical connections and do not block channels between conductors (24a and 42a). The method for forming such feed-through vias and interconnections utilizes metallic resist (36 and 40) which covers the feed-through vias so that the metallic resist, along with conventional photoresist material, prevent undesired etching of the feed-through vias even in the event of misregistration of the photoresist material.
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Hughes Aircraft Company
Karambelas A. W.
Nimmo Morris H.
Sternfels Lewis B.
Taylor Ronald L.
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