Granted Patent
Utility
US 5,773,788 · App. 08/707,247
Gas mixtures for plasma arc torch cutting and marking systems
Inventors:
Zhipeng Lu, Elizabeth B. Hackett
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Sep 3, 1996
Inventors
Zhipeng Lu
Elizabeth B. Hackett
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.