Granted Patent
Utility
US 4,438,435 · App. 06/282,342
Two-way ranging system
Inventors:
Gunter Hofgen, Hinrich Ecklundt
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Jul 10, 1981
Inventors
Gunter Hofgen
Hinrich Ecklundt
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.