Granted Patent
Utility
US 4,875,380 · App. 07/136,849
Corrugated jacket for molten metal sampler
Inventor:
Joseph J. Boron
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Dec 22, 1987
Inventor
Joseph J. Boron
Assignee (at issue)
MIDWEST INSTRUMENT COMPANY
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.