Granted Patent
Utility
US 5,019,488 · App. 07/517,530
Method of producing an image reversal negative photoresist having a photo-labile blocked imide
Inventors:
Donald Mammato, Sangya Jain, Dana L. Durham, Mark A. Spak, Douglas A. Usifer, Michael J. McFarland
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Apr 24, 1990
Inventors
Donald Mammato
Sangya Jain
Dana L. Durham
Mark A. Spak
Douglas A. Usifer
Michael J. McFarland
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.