Granted Patent
Utility
US 4,251,691 · App. 05/965,602
Picture/audio signal transmission system
Inventors:
Hideto Kakihara, Kenichi Hiratsuka, Yoji Shibata, Wataru Kosuge
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Dec 1, 1978
Inventors
Hideto Kakihara
Kenichi Hiratsuka
Yoji Shibata
Wataru Kosuge
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
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.