Granted Patent
Utility
US 5,122,852 · App. 07/514,914
Grafted-crystal-film integrated optics and optoelectronic devices
Inventors:
Winston K. Chang, Alfredo Yi-Yan
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: Apr 23, 1990
Inventors
Winston K. Chang
Alfredo Yi-Yan
Assignee (at issue)
Bell Communications Research, Inc.
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.