Granted Patent
Utility
US 4,916,281 · App. 07/313,824
Gas back-purging during welding of pipe
Inventors:
Lee M. Flasche, Gregory L. Hoback, James L. Meyers
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Feb 23, 1989
Inventors
Lee M. Flasche
Gregory L. Hoback
James L. Meyers
Assignee (at issue)
Haynes International, 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.