Granted Patent
Utility
US 6,274,000 · App. 09/424,308
Method and device in threading of paper web
Inventors:
Pekka Koivukunnas, Kari Salminen
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Nov 22, 1999
Inventors
Pekka Koivukunnas
Kari Salminen
Assignee (at issue)
Valmet Aktiebolag
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.