Granted Patent
Utility
US 4,167,376 · App. 05/798,924
Axial fan
Inventor:
Hermann Papst
Patented Case
View Patent ↗
Granted: Sep 11, 1979
Filed: May 20, 1977
Inventor
Hermann Papst
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.