Granted Patent
Utility
US 6,297,909 · App. 09/453,035
Focus detecting optical system
Inventor:
Takayuki Sensui
Patented Case
View Patent ↗
Granted: Oct 2, 2001
Filed: Dec 2, 1999
Inventor
Takayuki Sensui
Assignee (at issue)
Asahi Kogaku Kogyo 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.