Granted Patent
Utility
US 6,243,228 · App. 09/028,953
Information storage and retrieval device
Inventors:
Takeshi Yoshida, Hiroshi Nishida, Kenji Tomida, Shozo Saegusa
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: Feb 24, 1998
Inventors
Takeshi Yoshida
Hiroshi Nishida
Kenji Tomida
Shozo Saegusa
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.