Granted Patent
Utility
US 6,813,089 · App. 10/352,239
Extender optical system
Inventor:
Katsuhisa Tsutsumi
Patented Case
View Patent ↗
Granted: Nov 2, 2004
Filed: Jan 28, 2003
Inventor
Katsuhisa Tsutsumi
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.