Granted Patent
Utility
US 5,693,749 · App. 08/530,648
Fractionation of phenol formaldehyde condensate and photoresist compositions produced therefrom
Inventors:
M. Dalil Rahman, Daniel P. Aubin, Dinesh N. Khanna, Sunit S. Dixit
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Sep 20, 1995
Inventors
M. Dalil Rahman
Daniel P. Aubin
Dinesh N. Khanna
Sunit S. Dixit
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.