Granted Patent
Utility
US 6,207,923 · App. 09/186,791
Plasma arc torch tip providing a substantially columnar shield flow
Inventor:
Jon W. Lindsay
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Nov 5, 1998
Inventor
Jon W. Lindsay
Assignee (at issue)
Hypertherm, 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.