Granted Patent
Utility
US 6,646,811 · App. 09/837,301
Optical element and compound display apparatus using the same
Inventor:
Kazutaka Inoguchi
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Apr 19, 2001
Inventor
Kazutaka Inoguchi
Assignee (at issue)
CANON KABUSHIKI KAISHA
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.