Granted Patent
Utility
US 4,957,846 · App. 07/290,009
Radiation sensitive compound and mixtures with trinuclear novolak oligomer with o-naphthoquinone diazide sulfonyl group
Inventors:
Alfred T. Jeffries, III, Andrew J. Blakeney, Medhat A. Toukhy
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Dec 27, 1988
Inventors
Alfred T. Jeffries, III
Andrew J. Blakeney
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.