Granted Patent
Utility
US 6,196,765 · App. 09/187,471
Inhibiting acid mine drainage by displacing oxygen in rock heap
Inventor:
Joseph G. Harrington
Patented Case
View Patent ↗
Granted: Mar 6, 2001
Filed: Nov 6, 1998
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.