Granted Patent
Utility
US 4,590,679 · App. 06/563,446
Compass systems
Inventors:
Rodney Livings, Harjit Singh
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Dec 20, 1983
Inventors
Rodney Livings
Harjit Singh
Assignee (at issue)
Nautech Limited
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.