Granted Patent
Utility
US 6,522,688 · App. 09/231,183
PCM codec and modem for 56K bi-directional transmission
Inventor:
Eric Morgan Dowling
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Jan 14, 1999
Inventor
Eric Morgan Dowling
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.