Granted Patent
Utility
US 5,399,456 · App. 07/978,099
Image reversal negative working photoresist containing O-quinone diazide and cross-linking compound
Inventors:
Mark A. Spak, Donald Mammato, Dana L. Durham, Sangya Jain
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Nov 19, 1992
Inventors
Mark A. Spak
Donald Mammato
Dana L. Durham
Sangya Jain
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.