Granted Patent
Utility
US 6,566,960 · App. 09/310,618
High back-EMF high pressure subwoofer having small volume cabinet low frequency cutoff and pressure resistant surround
Inventor:
Robert W. Carver
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: May 12, 1999
Inventor
Robert W. Carver
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.