Granted Patent
Utility
US 4,567,343 · App. 06/710,000
Welding torch with dual gas shielding
Inventors:
Eric C. Sullivan, Daniel Allford
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Mar 13, 1985
Inventors
Eric C. Sullivan
Daniel Allford
Assignee (at issue)
Hughes Tool Company - USA
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.