Granted Patent
Utility
US 5,589,036 · App. 08/115,110
Controlling pulp flow in an upflow pulp treatment tower
Inventor:
John A. Fleck
Patented Case
View Patent ↗
Granted: Dec 31, 1996
Filed: Sep 2, 1993
Inventor
John A. Fleck
Assignee (at issue)
Champion International Corporation Limited
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.