Granted Patent
Utility
US 6,169,812 · App. 09/173,606
Point source speaker system
Inventor:
Francis Allen Miller
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Oct 14, 1998
Inventor
Francis Allen Miller
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.