Granted Patent
Utility
US 5,122,012 · App. 07/650,748
Method for improving the characteristics of sulfate bearing soils
Inventor:
Daniel Walker
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: Feb 5, 1991
Inventor
Daniel Walker
Assignee (at issue)
Chemical 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.