Granted Patent
Utility
US 6,507,690 · App. 09/667,698
Optical device
Inventor:
Hideaki Okayama
Patented Case
View Patent ↗
Granted: Jan 14, 2003
Filed: Sep 22, 2000
Inventor
Hideaki Okayama
Assignee (at issue)
OKI ELECTRIC INDUSTRY CO., 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.