Granted Patent
Utility
US 5,633,967 · App. 08/419,601
Waveguide fiber optical coupler
Inventor:
Koichi Haruta
Patented Case
View Patent ↗
Granted: May 27, 1997
Filed: Apr 10, 1995
Inventor
Koichi Haruta
Assignee (at issue)
Mitsui Petrochemical Industries, 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.