Granted Patent
Utility
US 6,409,643 · App. 09/297,491
Take-out leading roll, spreader roll, or equivalent for a web-like material
Inventors:
Lassi Karvonen, Pekka Koivukunnas
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Jul 2, 1999
Inventors
Lassi Karvonen
Pekka Koivukunnas
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.