Granted Patent
Utility
US 5,281,920 · App. 07/934,102
On-line battery impedance measurement
Inventor:
John W. Wurst
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Aug 21, 1992
Inventor
John W. Wurst
Assignee (at issue)
BTECH Inc.
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.