Granted Patent
Utility
US 5,069,521 · App. 07/519,217
Optical transmission apparatus
Inventor:
David Hardwick
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: May 7, 1990
Inventor
David Hardwick
Assignee (at issue)
GEC Plessey Telecommunication Limited
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.