Granted Patent
Utility
US 4,512,955 · App. 06/349,920
Apparatus for water treatment
Inventor:
Kenji Etani
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Feb 18, 1982
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.