Granted Patent
Utility
US 5,015,333 · App. 07/068,721
Multi-stage pulp washing within a batch digester
Inventor:
Ralph S. Grant
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Jun 29, 1987
Inventor
Ralph S. Grant
Assignee (at issue)
Beloit Corporation
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.