Granted Patent
Utility
US 4,713,293 · App. 06/760,406
Magnetic recording media
Inventors:
Masao Asano, Ryosuke Isobe, Yasuhisa Yamauchi, Hiroaki Yamagishi
Patented Case
View Patent ↗
Granted: Dec 15, 1987
Filed: Jul 30, 1985
Inventors
Masao Asano
Ryosuke Isobe
Yasuhisa Yamauchi
Hiroaki Yamagishi
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.