Granted Patent
Utility
US 6,785,200 · App. 09/608,437
Diffraction grating element and optical pickup device incorporating the same
Inventors:
Kazuo Shiba, Fumio Kobayashi
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Jun 30, 2000
Inventors
Kazuo Shiba
Fumio Kobayashi
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.