Granted Patent
Utility
US 5,695,662 · App. 08/595,797
Plasma arc cutting process and apparatus using an oxygen-rich gas shield
Inventors:
Richard W. Couch, Jr., Nicholas A. Sanders, Lifeng Luo, John Sobr
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Feb 2, 1996
Inventors
Richard W. Couch, Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
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.