Granted Patent
Utility
US 4,581,516 · App. 06/515,913
Plasma torch with a common gas source for the plasma and for the secondary gas flows
Inventors:
Bruce O. Hatch, Richard A. Spaulding
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jul 20, 1983
Inventors
Bruce O. Hatch
Richard A. Spaulding
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.