Granted Patent
Utility
US 4,184,533 · App. 05/910,763
Machine for shaping sand into cores or molds
Inventor:
Michael D. Breitbarth
Patented Case
View Patent ↗
Granted: Jan 22, 1980
Filed: May 30, 1978
Inventor
Michael D. Breitbarth
Assignee (at issue)
ESCO GROUP LLC
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.