Granted Patent
Utility
US 6,528,149 · App. 09/811,471
Perpendicular-magnetic recording media and magnetic recording apparatus
Inventors:
Kazuetsu Yoshida, Masaaki Futamoto, Yoshiyuki Hirayama
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Mar 20, 2001
Inventors
Kazuetsu Yoshida
Masaaki Futamoto
Yoshiyuki Hirayama
Assignee (at issue)
HITACHI, 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.