Granted Patent
Utility
US 4,806,081 · App. 07/221,947
Miniature axial fan
Inventors:
Siegfried Harmsen, Gunter Wrobel
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Jul 6, 1988
Inventors
Siegfried Harmsen
Gunter Wrobel
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.