Inventor
HARTLEY PHILLIP A
US3 patents
Patents
3 patentsUS5519633AMay 21, 1996
Method and apparatus for the cross-sectional design of multi-layer printed circuit boards
IBM50 citations91
US4374911AFeb 22, 1983
Photo method of making tri-level density photomask
IBM29 citations88
US5546321AAug 13, 1996
Method and apparatus for the cross-sectional design of multi-layer printed circuit boards
IBM41 citations87