Granted Patent
Utility
US 4,823,034 · App. 07/112,934
Brushless DC motor with tolerance compensation spring
Inventor:
Gunter Wrobel
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Oct 27, 1987
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.