Granted Patent
Utility
US 5,291,412 · App. 07/856,716
Navigation system
Inventors:
Haruhisa Tamai, Tatsuhiko Abe
Patented Case
View Patent ↗
Granted: Mar 1, 1994
Filed: Mar 24, 1992
Inventors
Haruhisa Tamai
Tatsuhiko Abe
Assignee (at issue)
Zexel GmbH
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.