Granted Patent
Utility
US 4,852,540 · App. 07/191,877
High-efficiency charging and regulating system
Inventor:
Edward J. Safranek
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: May 9, 1988
Inventor
Edward J. Safranek
Assignee (at issue)
F & B Mfg. Co.
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.