Granted Patent
Utility
US 5,333,673 · App. 08/127,195
Metal casting in a sand mold having a sodium bentonite clay binder mixture
Inventor:
John Hughes
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Sep 27, 1993
Inventor
John Hughes
Assignee (at issue)
American Colloid 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.