Granted Patent
Utility
US 6,594,491 · App. 09/064,376
Method and system for generating information-bearing audible tones
Inventors:
Stephanie Petrakos, Edward A. Youngs
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Apr 22, 1998
Inventors
Stephanie Petrakos
Edward A. Youngs
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.