Granted Patent
Utility
US 5,038,112 · App. 07/520,783
Levelling control circuit
Inventor:
Simon Philip O'Neill
Patented Case
View Patent ↗
Granted: Aug 6, 1991
Filed: May 8, 1990
Inventor
Simon Philip O'Neill
Assignee (at issue)
Technophone 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.