Granted Patent
Utility
US 5,400,858 · App. 08/120,478
Groundwater recovery system
Inventors:
Charles E. Blanchard, John J. Mastroianni
Patented Case
View Patent ↗
Granted: Mar 28, 1995
Filed: Sep 13, 1993
Inventors
Charles E. Blanchard
John J. Mastroianni
Assignee (at issue)
International Technology Group
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.