Granted Patent
Utility
US 6,306,296 · App. 09/197,756
Groundwater and soil remediation with microporous diffusion apparatus
Inventor:
William B. Kerfoot
Patented Case
View Patent ↗
Granted: Oct 23, 2001
Filed: Nov 23, 1998
Inventor
William B. Kerfoot
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.