Granted Patent
Utility
US 4,797,345 · App. 07/068,397
Light-sensitive 1,2-naphthoquinone-2-diazide-4-sulfonic acid monoesters of cycloalkyl substituted phenol and their use in light-sensitive mixtures
Inventor:
Alfred T. Jeffries, III
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Jul 1, 1987
Inventor
Alfred T. Jeffries, III
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.