Granted Patent
Utility
US 6,437,626 · App. 09/786,365
Device for removing noise in AC power waveform
Inventor:
Kazuo Ohtsubo
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Apr 23, 2001
Inventor
Kazuo Ohtsubo
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.