Granted Patent
Utility
US 4,955,791 · App. 07/247,336
Small size fan
Inventor:
Gunter Wrobel
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Sep 21, 1988
Inventor
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.