Granted Patent
Utility
US 4,989,935 · App. 07/408,561
Optoelectronic transmitter and receiver
Inventor:
Karl-Ulrich Stein
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Sep 18, 1989
Inventor
Karl-Ulrich Stein
Assignee (at issue)
Siemens Aktiengesellschaft
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.