Granted Patent
Utility
US 4,846,540 · App. 07/148,294
Optical wavegide junction
Inventor:
Elyahou Kapon
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jan 25, 1988
Inventor
Elyahou Kapon
Assignee (at issue)
Bell Communications Research, Inc.
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.