Granted Patent
Utility
US 5,184,938 · App. 07/708,132
Axial fan with a cylindrical outer housing
Inventor:
Siegfried Harmsen
Patented Case
View Patent ↗
Granted: Feb 9, 1993
Filed: May 30, 1991
Inventor
Siegfried Harmsen
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.