Granted Patent
Utility
US 6,229,602 · App. 09/179,613
Photometering apparatus
Inventors:
Isamu Hirai, Tadahisa Ohkura
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Oct 27, 1998
Inventors
Isamu Hirai
Tadahisa Ohkura
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.