Granted Patent
Utility
US 6,193,222 · App. 09/245,587
Gas-liquid contact tray and method
Inventor:
Zhongliang L. Fan
Patented Case
View Patent ↗
Granted: Feb 27, 2001
Filed: Feb 8, 1999
Inventor
Zhongliang L. Fan
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.