Granted Patent
Utility
US 5,405,498 · App. 08/080,910
Method for improving pulp washing efficiency
Inventor:
Jacqueline K. Pease
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Jun 22, 1993
Inventor
Jacqueline K. Pease
Assignee (at issue)
Betz PaperChem Inc.
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.