Granted Patent
Utility
US 5,756,959 · App. 08/738,723
Coolant tube for use in a liquid-cooled electrode disposed in a plasma arc torch
Inventors:
Jennifer Freeman, Zhipeng Lu, Richard W. Couch, Jr., Roger L. Kenyon
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Oct 28, 1996
Inventors
Jennifer Freeman
Zhipeng Lu
Richard W. Couch, Jr.
Roger L. Kenyon
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.