Granted Patent
Utility
US 4,860,704 · App. 07/187,938
Hinge valved rotary engine with separate compression and expansion sections
Inventor:
Eldon E. Slaughter
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Apr 29, 1988
Inventor
Eldon E. Slaughter
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.