Granted Patent
Utility
US 4,410,337 · App. 06/139,162
Method and an apparatus for separating a gas from a fibre suspension
Inventors:
Johan Gullichsen, Jaakko Kujala, Toivo Niskanen, Voitto Reponen, Esko Härkönen
Patented Case
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Granted: Oct 18, 1983
Filed: Apr 7, 1980
Inventors
Johan Gullichsen
Jaakko Kujala
Toivo Niskanen
Voitto Reponen
Esko Härkönen
Assignee (at issue)
A. Ahlstrom Osakeyhtio
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.