Granted Patent
Utility
US 5,695,650 · App. 08/552,226
Method for dewatering previously-dewatered municipal waste-water sludges using high electrical voltage
Inventor:
Jeffery S. Held
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Nov 2, 1995
Inventor
Jeffery S. Held
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.