Granted Patent
Utility
US 4,564,335 · App. 06/718,832
Axial flow fan
Inventors:
Siegfried Harmsen, Georg Papst, Gunter Wrobel
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Apr 2, 1985
Inventors
Siegfried Harmsen
Georg Papst
Gunter Wrobel
Assignee (at issue)
Papst Motoren GmbH & Co KG
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.