Granted Patent
Utility
US 6,521,090 · App. 09/744,555
Method and device for changing the natural frequency of a nip roll construction in a paper or board machine
Inventors:
Juhani Vestola, Jorma Kolio, Arto Puranen
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Jan 24, 2001
Inventors
Juhani Vestola
Jorma Kolio
Arto Puranen
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.