Granted Patent
Utility
US 5,380,976 · App. 08/024,416
Process for high quality plasma arc and laser cutting of stainless steel and aluminum
Inventors:
Richard W. Couch, Jr., Nicholas A. Sanders, Zhipeng Lu, Lifeng Luo, Staffan C. O. Stenfelt
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Mar 1, 1993
Inventors
Richard W. Couch, Jr.
Nicholas A. Sanders
Zhipeng Lu
Lifeng Luo
Staffan C. O. Stenfelt
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.