Granted Patent
Utility
US 6,665,147 · App. 09/897,401
Magnetic disk drive with supply of perfluoropolyether as lubricant
Inventors:
Takayuki Nakakawaji, Mina Ishida, Yutaka Ito, Hiroyuki Matsumoto, Hiroshi Tani
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Jul 3, 2001
Inventors
Takayuki Nakakawaji
Mina Ishida
Yutaka Ito
Hiroyuki Matsumoto
Hiroshi Tani
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.