Granted Patent
Utility
US 5,166,494 · App. 07/682,992
Process and apparatus for reducing electrode wear in a plasma arc torch
Inventors:
Lifeng Luo, Nicholas A. Sanders, Richard W. Couch, Jr.
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Apr 12, 1991
Inventors
Lifeng Luo
Nicholas A. Sanders
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.