Granted Patent
Utility
US 5,656,413 · App. 08/535,701
Low metal ion containing 4,4'-[1-[4-[1-(4-Hydroxyphenyl)-1-methylethyl]phenyl]ethylidene]bisphe nol and photoresist compositions therefrom
Inventors:
M. Dalil Rahman, Daniel P. Aubin
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Sep 28, 1995
Inventors
M. Dalil Rahman
Daniel P. Aubin
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.