Granted Patent
Utility
US 6,270,663 · App. 09/618,587
Storm drain filter system
Inventor:
Henry Happel
Patented Case
View Patent ↗
Granted: Aug 7, 2001
Filed: Jul 17, 2000
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.