Granted Patent
Utility
US 6,289,008 · App. 09/638,028
Communication system
Inventors:
Kenichi Sakamoto, Tsutomu Kusaki, Masaru Murakami, Takashi Yokoyama
Patented Case
View Patent ↗
Granted: Sep 11, 2001
Filed: Aug 15, 2000
Inventors
Kenichi Sakamoto
Tsutomu Kusaki
Masaru Murakami
Takashi Yokoyama
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.