Granted Patent
Utility
US 4,973,816 · App. 07/329,732
Plasma torch with safety switch
Inventor:
Randy G. Haberman
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Mar 28, 1989
Inventor
Randy G. Haberman
Assignee (at issue)
Delaware Capital Formation, 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.