Granted Patent
Utility
US 6,407,892 · App. 09/725,317
Magnetic recording and reading device
Inventor:
Yoshihiro Shiroishi
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Nov 29, 2000
Inventor
Yoshihiro Shiroishi
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.