Granted Patent
Utility
US 4,284,029 · App. 06/081,258
Take-off safety indicator for aircraft
Inventor:
Graham ROBERTS
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Oct 2, 1979
Inventor
Graham ROBERTS
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.