Granted Patent
Utility
US 5,601,734 · App. 08/554,638
Electrode for a plasma arc torch
Inventors:
Lifeng Luo, Richard W. Couch, Jr.
Patented Case
View Patent ↗
Granted: Feb 11, 1997
Filed: Nov 6, 1995
Inventors
Lifeng Luo
Richard W. Couch, Jr.
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.