Granted Patent
Utility
US 5,408,354 · App. 08/017,784
Optical Isolator
Inventor:
Tadatoshi Hosokawa
Patented Case
View Patent ↗
Granted: Apr 18, 1995
Filed: Feb 16, 1993
Inventor
Tadatoshi Hosokawa
Assignee (at issue)
Chichibu Cement 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.