Granted Patent
Utility
US 4,892,801 · App. 07/170,534
Mixed ester O-quinone diazide photosensitizers and process of preparation
Inventors:
Robert E. Potvin, Jonas O. St. Alban, Chester J. Sobodacha
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Mar 21, 1988
Inventors
Robert E. Potvin
Jonas O. St. Alban
Chester J. Sobodacha
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.