Granted Patent
Utility
US 4,909,711 · App. 06/786,118
Small fan with electric drive motor
Inventors:
Martin Burgbacher, Siegfried Harmsen, Georg Papst
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Oct 10, 1985
Inventors
Martin Burgbacher
Siegfried Harmsen
Georg 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.