Granted Patent
Utility
US 6,641,901 · App. 10/340,597
Perpendicular-magnetic recording media and magnetic recording apparatus
Inventors:
Kazuetsu Yoshida, Masaaki Futamoto, Yoshiyuki Hirayama
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Jan 13, 2003
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.