Granted Patent
Utility
US 6,435,769 · App. 09/800,636
Gas-phase modification in earth materials
Inventor:
Joseph G. Harrington
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Mar 6, 2001
Inventor
Joseph G. Harrington
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.