Granted Patent
Utility
US 4,518,989 · App. 06/428,971
Buffer memory dispersion type video/audio transmission system with spatially and timewise divided inter-office junction lines
Inventors:
Akira Yabiki, Norio Imanishi, Yoji Shibata, Wataru Kosuge, Nobumichi Yukawa
Patented Case
View Patent ↗
Granted: May 21, 1985
Filed: Sep 30, 1982
Inventors
Akira Yabiki
Norio Imanishi
Yoji Shibata
Wataru Kosuge
Nobumichi Yukawa
Assignees (at issue)
HITACHI, LTD.
Nippon Telegraph and Telephone Public Corporation
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.