Granted Patent
Utility
US 4,684,475 · App. 06/633,444
Organophosphate and silicate containing antifreeze
Inventor:
William N. Matulewicz
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Jul 23, 1984
Inventor
William N. Matulewicz
Assignee (at issue)
First Brands 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.