Granted Patent
Utility
US 6,716,313 · App. 10/134,497
Additive for paper making
Inventors:
Tapio Vihervaara, Kari Luukkonen, Veikko Niinivaara
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Apr 30, 2002
Inventors
Tapio Vihervaara
Kari Luukkonen
Veikko Niinivaara
Assignee (at issue)
Raisio Chemicals, Ltd.
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.