Granted Patent
Utility
US 6,047,724 · App. 09/022,176
Risers for a waste water treatment facility
Inventor:
Harry L. Nurse, Jr.
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: Feb 11, 1998
Inventor
Harry L. Nurse, Jr.
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.