Granted Patent
Utility
US 4,996,407 · App. 07/332,591
Plasma arc transfer controller
Inventor:
John C. Traxler
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Apr 3, 1989
Inventor
John C. Traxler
Assignee (at issue)
HyperPower, 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.