Granted Patent
Utility
US 4,225,769 · App. 05/836,816
Plasma torch starting circuit
Inventor:
Raymond G. Wilkins
Patented Case
View Patent ↗
Granted: Sep 30, 1980
Filed: Sep 26, 1977
Inventor
Raymond G. Wilkins
Assignee (at issue)
Thermal Dynamics Corporation
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.