Granted Patent
Utility
US 6,338,037 · App. 09/142,449
Audio signal identification using code labels inserted in the audio signal
Inventors:
Martin Peter Todd, Nigel Johnson
Patented Case
View Patent ↗
Granted: Jan 8, 2002
Filed: Jan 11, 1999
Inventors
Martin Peter Todd
Nigel Johnson
Assignee (at issue)
Central Research Laboratories 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.