Granted Patent
Utility
US 4,909,616 · App. 07/302,040
Optical system for recording and reproducing an optical information medium
Inventor:
Norikazu Arai
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jan 24, 1989
Inventor
Norikazu Arai
Assignee (at issue)
Konishiroku Photo Industry Co., 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.