Granted Patent
Utility
US 6,261,411 · App. 09/652,066
Process for kraft chemical recovery
Inventor:
Christopher Roberts
Patented Case
View Patent ↗
Granted: Jul 17, 2001
Filed: Aug 31, 2000
Inventor
Christopher Roberts
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.