Granted Patent
Utility
US 5,542,382 · App. 08/119,106
Dual compression and dual expansion internal combustion engine and method therefor
Inventor:
John M. Clarke
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Apr 1, 1991
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.