Granted Patent
Utility
US 4,972,431 · App. 07/412,049
P-code-aided global positioning system receiver
Inventor:
Richard G. Keegan
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Sep 25, 1989
Inventor
Richard G. Keegan
Assignee (at issue)
Magnavox Government and Industrial Electronics Company
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.