Granted Patent
Utility
US 4,435,193 · App. 06/439,600
Controlling operation of a centrifugal pump
Inventors:
Johan Gullichsen, Esko Härkönen, Toivo Niskanen, Jaakko Kujala, Voitto Reponen
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Nov 5, 1982
Inventors
Johan Gullichsen
Esko Härkönen
Toivo Niskanen
Jaakko Kujala
Voitto Reponen
Assignee (at issue)
Kamyr AB
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.