Granted Patent
Utility
US 6,646,739 · App. 09/829,875
Four-stage type monochromator
Inventor:
Tsutomu Kaneko
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Apr 10, 2001
Inventor
Tsutomu Kaneko
Assignee (at issue)
Ando Electric 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.