Granted Patent
Utility
US 4,355,680 · App. 06/203,008
Method and apparatus for continuous casting of hollow articles
Inventor:
John G. Frantzreb, Sr.
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Nov 3, 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.