Granted Patent
Utility
US 4,594,423 · App. 06/631,668
Separation of picoline isomers
Inventor:
Hermann A. Zinnen
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Jul 16, 1984
Inventor
Hermann A. Zinnen
Assignee (at issue)
UOP LLC
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.