Granted Patent
Utility
US 6,540,871 · App. 09/467,902
Method for processing black liquor sediment
Inventor:
Robert M. Rumph
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Dec 21, 1999
Inventor
Robert M. Rumph
Assignee (at issue)
The Maitland Company, LLC
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.