Granted Patent
Utility
US 6,607,848 · App. 09/807,983
Magnetic recording medium and magnetic recording device
Inventors:
Masahiro Oka, Shinya Katayama
Patented Case
View Patent ↗
Granted: Aug 19, 2003
Filed: May 1, 2001
Inventors
Masahiro Oka
Shinya Katayama
Assignee (at issue)
Showa Denko K.K.
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.