Granted Patent
Utility
US 4,891,971 · App. 07/287,238
Engine monitoring apparatus
Inventors:
John W. Jones, Peter O'Sullivan
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 21, 1988
Inventors
John W. Jones
Peter O'Sullivan
Assignee (at issue)
Smiths Group PLC
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.