Granted Patent
Utility
US 6,489,599 · App. 09/802,897
Optical pickup device
Inventor:
Tadashi Takeda
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Mar 12, 2001
Inventor
Tadashi Takeda
Assignee (at issue)
Kabushiki Kaisha Sankyo Seiki Seisakusho
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.