Granted Patent
Utility
US 6,681,024 · App. 09/128,835
Device including a built-in electroacoustic transducer for optimum speech reproduction
Inventors:
Erich Klein, Heinz Renner
Patented Case
View Patent ↗
Granted: Jan 20, 2004
Filed: Aug 4, 1998
Inventors
Erich Klein
Heinz Renner
Assignee (at issue)
KONINKLIJKE PHILIPS ELECTRONICS NV
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.