Granted Patent
Utility
US 6,440,199 · App. 09/931,579
Electric filter
Inventor:
Juha Tolvanen
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Aug 16, 2001
Inventor
Juha Tolvanen
Assignee (at issue)
ALSTOM (Switzerland) Ltd
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.