Granted Patent
Utility
US 5,647,890 · App. 08/686,332
Filter apparatus with induced voltage electrode and method
Inventor:
Yujiro Yamamoto
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Jul 25, 1996
Inventor
Yujiro Yamamoto
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.