Granted Patent
Utility
US 5,002,851 · App. 07/200,676
Light sensitive composition with o-quinone diazide and phenolic novolak resin made using methylol substituted trihydroxybenzophenone as reactant
Inventor:
Medhat A. Toukhy
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: May 31, 1988
Inventor
Medhat A. Toukhy
Assignee (at issue)
Olin Hunt Specialty Products, Inc.
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.