Granted Patent
Utility
US 4,609,788 · App. 06/471,138
Digital voice transmission having improved echo suppression
Inventors:
William J. Miller, Chun Chian Lu
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Mar 1, 1983
Inventors
William J. Miller
Chun Chian Lu
Assignee (at issue)
Racal Data Communications, 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.