Granted Patent
Utility
US 6,235,255 · App. 09/316,234
Catalyst support having zeolite with high sodium back ion-exchange capacity and catalysts made therefrom
Inventor:
Karl Kharas
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: May 21, 1999
Inventor
Karl Kharas
Assignee (at issue)
ASEC Manufacturing
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.