Granted Patent
Utility
US 6,500,304 · App. 09/763,010
Method and device for changing the natural frequency of a nip roll construction in a paper or board machine
Inventors:
Kari Holopainen, Juha Ehrola
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Feb 14, 2001
Inventors
Kari Holopainen
Juha Ehrola
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.