Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1975-10-14
1976-10-05
Smith, Alfred E.
Radiant energy
Coded record and readers; invisible radiant energy type
29579, 250492A, 250505, B01J 1700, G21K 100, G21K 500, G01N 2320
Patent
active
039846806
ABSTRACT:
An alignment system for aligning one or more soft X-ray lithographic masks with respect to a substrate to be exposed in a soft X-ray lithographic apparatus includes alignment marks on the masks and corresponding alignment marks on a substrate, and a means for detecting X-rays emitted from the alignment marks on the substrate.
REFERENCES:
patent: 3588347 (1971-06-01), Montone et al.
patent: 3742229 (1973-06-01), Smith et al.
patent: 3742230 (1973-06-01), Spears et al.
patent: 3743842 (1973-07-01), Smith et al.
patent: 3892973 (1975-07-01), Coquin
Grigsby T. N.
Hieken Charles
Massachusetts Institute of Technology
Santa Martin M.
Smith Alfred E.
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