Granted Patent
Utility
US 5,081,647 · App. 07/294,167
Communication of a voice signal via continuous quadrature amplitude modulator
Inventor:
Gordon Bremer
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Jan 6, 1989
Inventor
Gordon Bremer
Assignee (at issue)
American Telephone and Telegraph, Co.
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.