Granted Patent
Utility
US 4,878,728 · App. 07/198,700
Multilayer integrated optical device
Inventor:
Lothar Mannschke
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: May 23, 1988
Inventor
Lothar Mannschke
Assignee (at issue)
U.S. Philips 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.