Granted Patent
Utility
US 4,716,244 · App. 06/853,839
Process for the preparation of sterically hindered hydroxyphenylcarboxylic acid esters
Inventor:
Ivan Orban
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Apr 21, 1986
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.