Granted Patent
Utility
US 4,807,276 · App. 07/147,325
Re-transmission method and apparatus in communication system using public communication lines
Inventor:
Shinichi Okabe
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Jan 22, 1988
Inventor
Shinichi Okabe
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.