Granted Patent
Utility
US 4,295,154 · App. 06/063,467
Digital video and audio file system
Inventors:
Hidetoh Hata, Katsumi Haji, Kazushige Sako, Yoji Shibata, Masahiko Achiha
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Aug 3, 1979
Inventors
Hidetoh Hata
Katsumi Haji
Kazushige Sako
Yoji Shibata
Masahiko Achiha
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.