Granted Patent
Utility
US 4,701,009 · App. 06/697,802
Spectral filter for integrated optics
Inventors:
Gregory L. Tangonan, Huan-Wun Yen
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: Feb 4, 1985
Inventors
Gregory L. Tangonan
Huan-Wun Yen
Assignee (at issue)
Hughes Aircraft Company
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.