Granted Patent
Utility
US 4,946,595 · App. 07/243,319
Process and apparatus for re-cycling engine coolant
Inventor:
Robert C. Miller
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Sep 9, 1988
Inventor
Robert C. Miller
Assignee (at issue)
FPPF Chemical Corporation 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.