Granted Patent
Utility
US 4,578,149 · App. 06/434,758
Process for digesting cellulosic material with heat recovery
Inventor:
Bertil K. E. Fagerlund
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Oct 18, 1982
Inventor
Bertil K. E. Fagerlund
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.