Granted Patent
Utility
US 4,789,583 · App. 07/071,559
Magnetic recording medium
Inventor:
Shigeru Akutsu
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Jul 8, 1987
Inventor
Shigeru Akutsu
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.