Granted Patent
Utility
US 4,992,029 · App. 07/312,971
Miniature axial fan
Inventors:
Siegfried Harmsen, Gunter Wrobel
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Feb 21, 1989
Inventors
Siegfried Harmsen
Gunter Wrobel
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.