Granted Patent
Utility
US 4,767,169 · App. 07/019,369
Thin film waveguide electrooptic modulator
Inventors:
Chia-Chi Teng, Dagobert E. Stuetz
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Feb 26, 1987
Inventors
Chia-Chi Teng
Dagobert E. Stuetz
Assignee (at issue)
Hoechst Celanese 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.