Granted Patent
Utility
US 4,775,485 · App. 07/093,186
Method for water treatment
Inventor:
Kenji Etani
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Sep 4, 1987
Inventor
Kenji Etani
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.