Granted Patent
Utility
US 4,247,750 · App. 05/807,943
Vertically positioned submerged arc flux dam
Inventor:
Robert Hupe
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jun 2, 1977
Inventor
Robert Hupe
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.