Granted Patent
Utility
US 4,449,092 · App. 06/335,153
Capacitor charging circuit for discharge type welding tool
Inventor:
Yoshiteru Kondo
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Dec 28, 1981
Inventor
Yoshiteru Kondo
Assignee (at issue)
USM Holding AG
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.