Granted Patent
Utility
US 4,920,745 · App. 07/175,425
Internal combustion engines
Inventor:
Wayne Gilbert
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Aug 11, 1987
Inventor
Wayne Gilbert
Assignee (at issue)
Orbital Engine Company Proprietary Limited
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.