Granted Patent
Utility
US 4,452,715 · App. 06/436,261
High pH coolant containing carbonate ion
Inventor:
Stanley T. Hirozawa
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Oct 25, 1982
Inventor
Stanley T. Hirozawa
Assignee (at issue)
BASF Wyandotte Corporation
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.