Granted Patent
Utility
US 4,886,415 · App. 07/083,792
Fan with an essentially square housing
Inventors:
Raimund Engelberger, Siegfried Harmsen, Hilmar Kirchgessner, Josef Schneider
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Sep 25, 1987
Inventors
Raimund Engelberger
Siegfried Harmsen
Hilmar Kirchgessner
Josef Schneider
Assignee (at issue)
Papst Motoren
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.