Granted Patent
Utility
US 6,335,973 · App. 08/956,677
System and method for improving clarity of audio systems
Inventor:
Eliot M. Case
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Oct 23, 1997
Inventor
Eliot M. Case
Assignee (at issue)
Qwest Communications International Inc.
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.