Granted Patent
Utility
US 5,456,219 · App. 08/361,272
Dual compression and dual expansion internal combustion engine and method therefor
Inventor:
John M. Clarke
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: Dec 21, 1994
Inventor
John M. Clarke
Assignee (at issue)
Caterpillar 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.