Granted Patent
Utility
US 4,902,871 · App. 07/249,407
Apparatus and process for cooling a plasma arc electrode
Inventors:
Nicholas A. Sanders, Richard W. Couch, Jr.
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Sep 26, 1988
Inventors
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.