Granted Patent
Utility
US 5,359,665 · App. 08/157,430
Audio bass frequency enhancement
Inventor:
Donn R. Werrbach
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Nov 26, 1993
Inventor
Donn R. Werrbach
Assignee (at issue)
Aphex Systems, Ltd.
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.