Granted Patent
Utility
US 5,157,748 · App. 07/744,897
Controllable integrated optical directional coupler
Inventors:
Gustav Mueller, Lothar Stoll
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Aug 14, 1991
Inventors
Gustav Mueller
Lothar Stoll
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.