Granted Patent
Utility
US 6,163,609 · App. 09/061,623
System and method for echo cancelling and mobile communications device
Inventors:
Jorma Makinen, Antti Vahatalo
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Apr 16, 1998
Inventors
Jorma Makinen
Antti Vahatalo
Assignee (at issue)
Nokia Telecommunications Oy
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.