Zeolite Y-based catalytic composition for use in the treatment of oxygenated effluents containing nitrogen oxides, its preparation and process for use

Granted: Jul 16, 1996 Filed: Aug 31, 1994

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.