Granted Patent
Utility
US 6,816,236 · App. 10/101,069
Projection optical system and projection and light exposure apparatus using it
Inventor:
Ryoko Otomo
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Mar 20, 2002
Inventor
Ryoko Otomo
Assignee (at issue)
Fuji Photo Optical Co., Ltd.
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.