Granted Patent
Utility
US 6,431,456 · App. 09/810,509
IC card
Inventors:
Hirotaka Nishizawa, Yosuke Yukawa, Takashi Totsuka
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Mar 19, 2001
Inventors
Hirotaka Nishizawa
Yosuke Yukawa
Takashi Totsuka
Assignee (at issue)
HITACHI, LTD.
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.