Granted Patent
Utility
US 6,513,893 · App. 09/977,236
Head drive unit and driving method
Inventors:
Takahiro Esaki, Naomi SHIRAI, Hirokazu Ikeda, Toshihiro Asoh, Masaharu Oyama, Takanobu Kajikawa, Kenichi Kimori, Michiteru Shichiro
Patented Case
View Patent ↗
Granted: Feb 4, 2003
Filed: Oct 16, 2001
Inventors
Takahiro Esaki
Naomi SHIRAI
Hirokazu Ikeda
Toshihiro Asoh
Masaharu Oyama
Takanobu Kajikawa
Kenichi Kimori
Michiteru Shichiro
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.