Granted Patent
Utility
US 4,393,298 · App. 06/190,132
Liquid cooling for a welding torch
Inventor:
John G. Frantzreb, Sr.
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Sep 24, 1980
Inventor
John G. Frantzreb, Sr.
Assignee (at issue)
Caterpillar Tractor Co.
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.