Granted Patent
Utility
US 4,684,572 · App. 06/726,034
Magnetic recording medium
Inventors:
Yoshitaka Yasufuku, Masaji Nara, Shigeru Akutsu
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Apr 23, 1985
Inventors
Yoshitaka Yasufuku
Masaji Nara
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.