Granted Patent
Utility
US 4,786,580 · App. 06/566,125
Method of developing imaged diazo material with propanol containing developer composition
Inventors:
Shane Hsieh, Wayne A. Mitchell
Patented Case
View Patent ↗
Granted: Nov 22, 1988
Filed: Dec 27, 1983
Inventors
Shane Hsieh
Wayne A. Mitchell
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.