Granted Patent
Utility
US 6,413,367 · App. 09/830,925
Treatment of cellulosic material with a chelating agent prior to alkaline delignification
Inventors:
Mikael Svedman, Thomas Fant, Seppo Martikainen
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Aug 3, 2001
Inventors
Mikael Svedman
Thomas Fant
Seppo Martikainen
Assignee (at issue)
Valmet Chemical Pulping OY
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.