Granted Patent
Utility
US 6,215,596 · App. 09/394,414
Optical element, optical device provided therewith, and method for evaluating optical element
Inventors:
Keisuke Araki, Tsunefumi Tanaka, Hiroaki Hoshi
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Sep 13, 1999
Inventors
Keisuke Araki
Tsunefumi Tanaka
Hiroaki Hoshi
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.