Granted Patent
Utility
US 5,685,334 · App. 08/474,865
Fuel additive metering system
Inventor:
William R. Hagan
Patented Case
View Patent ↗
Granted: Nov 11, 1997
Filed: Jun 7, 1995
Inventor
William R. Hagan
Assignee (at issue)
Rhone-Poulenc, 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.