Granted Patent
Utility
US 4,594,444 · App. 06/680,681
Process for the preparation of sterically hindered hydroxyphenylcarboxylic acid esters
Inventor:
Ivan Orban
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Dec 12, 1984
Inventor
Ivan Orban
Assignee (at issue)
Ciba-Geigy
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.