Granted Patent
Utility
US 5,334,481 · App. 07/692,811
Positive diazo quinone photoresist compositions containing antihalation compound
Inventor:
Hans-Joachim Merrem
Patented Case
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Granted: Aug 2, 1994
Filed: Apr 25, 1991
Inventor
Hans-Joachim Merrem
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.