Granted Patent
Utility
US 6,530,452 · App. 09/806,422
Reactive silencer for industrial air channels and its use
Inventors:
Henrik Pettersson, Keijo Nissilä, Juhani Jokinen, Tauno Heikkilä
Patented Case
View Patent ↗
Granted: Mar 11, 2003
Filed: Apr 17, 2001
Inventors
Henrik Pettersson
Keijo Nissilä
Juhani Jokinen
Tauno Heikkilä
Assignee (at issue)
Metso Paper Inc.
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.