Granted Patent
Utility
US 6,657,813 · App. 09/785,417
Perpendicular magnetic recording system
Inventors:
Yasutaka Nishida, Hisashi Takano, Masafumi Mochizuki
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Feb 20, 2001
Inventors
Yasutaka Nishida
Hisashi Takano
Masafumi Mochizuki
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.