Granted Patent
Utility
US 4,720,160 · App. 06/625,543
Optical resonant cavity filters
Inventor:
John W. Hicks, Jr.
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Jun 28, 1984
Inventor
John W. Hicks, Jr.
Assignee (at issue)
Polaroid 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.