Granted Patent
Utility
US 5,898,401 · App. 07/211,270
Continuous wave radar altimeter
Inventor:
Raymond John Walls
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Jun 9, 1988
Inventor
Raymond John Walls
Assignee (at issue)
GEC-Marconi Ltd.
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.