Granted Patent
Utility
US 5,757,538 · App. 08/532,636
Optical isolator
Inventor:
Kenichi Siroki
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Oct 2, 1995
Inventor
Kenichi Siroki
Assignee (at issue)
TOKIN CORPORATION
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.