Granted Patent
Utility
US 6,696,579 · App. 10/141,617
Alkylene carbonate purification
Inventor:
Andrew P. Kahn
Patented Case
View Patent ↗
Granted: Feb 24, 2004
Filed: May 8, 2002
Inventor
Andrew P. Kahn
Assignee (at issue)
Arco Chemical Technology, L.P.
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.