Granted Patent
Utility
US 4,611,293 · App. 06/555,885
Method and apparatus for automatic calibration of magnetic compass
Inventors:
Ronald R. Hatch, Richard G. Keegan
Patented Case
View Patent ↗
Granted: Sep 9, 1986
Filed: Nov 28, 1983
Inventors
Ronald R. Hatch
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.