Granted Patent
Utility
US 5,614,352 · App. 08/366,614
Metal ion reduction in novolak resins solution in PGMEA by chelating ion exchange resin
Inventor:
M. Dalil Rahman
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Dec 30, 1994
Inventor
M. Dalil Rahman
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.