Granted Patent
Utility
US 4,613,864 · App. 06/571,012
Position-fixing system
Inventor:
Gunter Hofgen
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Jan 16, 1984
Inventor
Gunter Hofgen
Assignee (at issue)
International Standard Electric Corporation
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.