Granted Patent
Utility
US 4,811,342 · App. 06/797,280
High speed analog echo canceller
Inventor:
Zheng Huang
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Nov 12, 1985
Inventor
Zheng Huang
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.