Granted Patent
Utility
US 5,307,441 · App. 07/442,830
Wear-toll quality 4.8 kbps speech codec
Inventor:
Forrest F. Tzeng
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: Nov 29, 1989
Inventor
Forrest F. Tzeng
Assignee (at issue)
Comsat, 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.