Granted Patent
Utility
US 6,833,981 · App. 10/079,427
Spin valve magnetic head with three underlayers
Inventors:
Shigekazu Suwabe, Shin Noguchi, Yasunari Tajima, Satoshi Shigematsu
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Feb 22, 2002
Inventors
Shigekazu Suwabe
Shin Noguchi
Yasunari Tajima
Satoshi Shigematsu
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.