Granted Patent
Utility
US 4,572,867 · App. 06/545,663
Magnetic recording medium
Inventors:
Issei Nakamura, Kenji Itozawa
Patented Case
View Patent ↗
Granted: Feb 25, 1986
Filed: Oct 26, 1983
Inventors
Issei Nakamura
Kenji Itozawa
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.