Granted Patent
Utility
US 6,132,556 · App. 09/192,210
Method of controlling pulp digester pressure via liquor extraction
Inventors:
C. Bertil Stromberg, J Robert Prough, Bruno Marcoccia, Richard O. Laakso, Carl Luhrmann
Patented Case
View Patent ↗
Granted: Oct 17, 2000
Filed: Sep 4, 1998
Inventors
C. Bertil Stromberg
J Robert Prough
Bruno Marcoccia
Richard O. Laakso
Carl Luhrmann
Assignee (at issue)
Andritz-Ahlstrom 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.