Granted Patent
Utility
US 6,421,189 · App. 09/495,904
Telephoto lens system
Inventor:
Takayuki Sensui
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Feb 2, 2000
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.