Granted Patent
Utility
US 4,875,001 · App. 07/281,487
Electronic switching power supply with a choke converter
Inventor:
Gunther Bergk
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Dec 8, 1988
Inventor
Gunther Bergk
Assignee (at issue)
The Braun Corporation
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.