Granted Patent
Utility
US 5,937,074 · App. 08/909,892
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: Aug 10, 1999
Filed: Aug 12, 1997
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.