Granted Patent
Utility
US 4,558,681 · App. 06/611,442
Exhaust gas and blow-by recirculation system for an internal combustion engine
Inventor:
Bhaskar Mookerjee
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: May 17, 1984
Inventor
Bhaskar Mookerjee
Assignee (at issue)
Caterpillar Tractor Co.
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.