Granted Patent
Utility
US 6,188,846 · App. 09/412,508
Optical system for focus detecting device
Inventor:
Takayuki Sensui
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Oct 5, 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.