Granted Patent
Utility
US 6,030,492 · App. 08/945,563
Impregnation of cellulose-containing material with black liquor in a single vessel digester
Inventors:
Finn Oulie, Lennart Sjolund
Patented Case
View Patent ↗
Granted: Feb 29, 2000
Filed: Jan 20, 1998
Inventors
Finn Oulie
Lennart Sjolund
Assignee (at issue)
Kvaerner Pulping AB
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.