Granted Patent
Utility
US 4,221,546 · App. 05/851,430
Axial fan
Inventors:
Georg Papst, Volker Schlicker, Gunter Wrobel
Patented Case
View Patent ↗
Granted: Sep 9, 1980
Filed: Nov 14, 1977
Inventors
Georg Papst
Volker Schlicker
Gunter Wrobel
Assignee (at issue)
Pabst-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.