Granted Patent
Utility
US 4,324,971 · App. 06/167,095
Torch height acquisition using arc transfer
Inventor:
Michael Frappier
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Jul 9, 1980
Inventor
Michael Frappier
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.