Granted Patent
Utility
US 5,923,225 · App. 08/943,360
Noise-reduction systems and methods using photonic bandgap crystals
Inventor:
Hector J. De Los Santos
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Oct 3, 1997
Inventor
Hector J. De Los Santos
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.