Granted Patent
Utility
US 5,659,067 · App. 08/712,720
Preparation of 2,5-bis(1,1-dimethyl-4-hexyloxycarbonylbutyl)hydroquinone
Inventor:
Reinhard Sommerlade
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Sep 12, 1996
Inventor
Reinhard Sommerlade
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.