Granted Patent
Utility
US 4,811,328 · App. 06/803,611
Optical recording and reproducing device
Inventors:
Tetsuo Ito, Hiroshi Sasaki, Yoshio Sato, Satoshi Shimada, Norifumi Miyamoto, Nobuyoshi Tsuboi, Hideki Nihei, Hiroaki Koyanagi
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Dec 2, 1985
Inventors
Tetsuo Ito
Hiroshi Sasaki
Yoshio Sato
Satoshi Shimada
Norifumi Miyamoto
Nobuyoshi Tsuboi
Hideki Nihei
Hiroaki Koyanagi
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.