Granted Patent
Utility
US 6,072,869 · App. 08/996,146
Adaptive method and apparatus for detecting a stutter dial tone signal
Inventors:
Christopher Henry Becker, Joseph Chan
Patented Case
View Patent ↗
Granted: Jun 6, 2000
Filed: Dec 22, 1997
Inventors
Christopher Henry Becker
Joseph Chan
Assignee (at issue)
Nortel Networks 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.