Granted Patent
Utility
US 6,687,380 · App. 09/466,487
Active sub-woofer speaker system
Inventor:
Tejaswi Vishwamitra
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Dec 17, 1999
Inventor
Tejaswi Vishwamitra
Assignee (at issue)
Broan-NuTone LLC
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.