Granted Patent
Utility
US 6,389,277 · App. 09/257,876
Cellular call mode determining device
Inventor:
Mark Salzwedel
Patented Case
View Patent ↗
Granted: May 14, 2002
Filed: Feb 25, 1999
Inventor
Mark Salzwedel
Assignee (at issue)
DENSO 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.