Granted Patent
Utility
US 5,118,219 · App. 07/672,836
Method of capping tailings ponds
Inventor:
Daniel Walker
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Mar 21, 1991
Inventor
Daniel Walker
Assignee (at issue)
Chemstar Lime Company
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.