Granted Patent
Utility
US 3,975,587 · App. 05/505,808
Digital vocoder
Inventors:
James Dunn, John Richard Cowan, Anthony Russo
Patented Case
View Patent ↗
Granted: Aug 17, 1976
Filed: Sep 13, 1974
Inventors
James Dunn
John Richard Cowan
Anthony Russo
Assignee (at issue)
International Telephone and Telegraph Corporation
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.