Granted Patent
Utility
US 6,208,731 · App. 09/168,331
Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator
Inventors:
Paul F. DePond, Gaylan Larson, Greg Neal, David Yewell
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Oct 6, 1998
Inventors
Paul F. DePond
Gaylan Larson
Greg Neal
David Yewell
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.