Granted Patent
Utility
US 5,689,556 · App. 08/528,762
Method of detecting narrow-band signals in an echo canceller
Inventors:
Prabhat K. Gupta, Sanjay Gupta
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Sep 15, 1995
Inventors
Prabhat K. Gupta
Sanjay Gupta
Assignee (at issue)
HUGHES ELECTRONICS LIMITED
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.