Granted Patent
Utility
US 5,594,098 · App. 08/272,962
Metal ion reduction in novolak resins and photoresists
Inventors:
M. Dalil Rahman, Dana L. Durham
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: Jul 11, 1994
Inventors
M. Dalil Rahman
Dana L. Durham
Assignee (at issue)
Hoechst Celanese Corporation
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.