Granted Patent
Utility
US 6,816,341 · App. 10/347,912
Hard disk drive utilizing second lubricant over a first lubricant having a phosophezine group
Inventors:
Hiroyuki Matsumoto, Hiroshi Tani, Mitsuhiro Shoda, Koji Sonoda, Takayuki Nakakawaji, Mina Amo, Yutaka Ito
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Jan 22, 2003
Inventors
Hiroyuki Matsumoto
Hiroshi Tani
Mitsuhiro Shoda
Koji Sonoda
Takayuki Nakakawaji
Mina Amo
Yutaka Ito
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.