Granted Patent
Utility
US 4,676,919 · App. 06/752,561
Low pH-buffered silicon/silicate antifreeze concentrates
Inventor:
Eugene A. Zientek
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Jul 10, 1985
Inventor
Eugene A. Zientek
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.