Granted Patent
Utility
US 6,428,692 · App. 09/859,714
In-line storm water drain filter system
Inventor:
Henry Happel
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: May 17, 2001
Inventor
Henry Happel
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.