Granted Patent
Utility
US 4,536,593 · App. 06/510,705
Process for the preparation of sterically hindered hydroxphenylcarboxylic acid esters
Inventors:
Ivan Orban, Eduard Troxler
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Jul 5, 1983
Inventors
Ivan Orban
Eduard Troxler
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.