Granted Patent
Utility
US 5,687,247 · App. 08/501,902
Surround for a loudspeaker
Inventor:
Lucio Proni
Patented Case
View Patent ↗
Granted: Nov 11, 1997
Filed: Jul 13, 1995
Inventor
Lucio Proni
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.