Granted Patent
Utility
US 5,211,920 · App. 07/861,054
Agglomerating agents for clay containing ores
Inventor:
David M. Polizzotti
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Apr 1, 1992
Inventor
David M. Polizzotti
Assignee (at issue)
Betz Laboratories, Inc.
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.