Granted Patent
Utility
US 6,504,937 · App. 09/115,980
Amplifier circuit for electret microphone with enhanced performance
Inventors:
Costas Papadopoulos, David J. Truesdell
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: Jul 15, 1998
Inventors
Costas Papadopoulos
David J. Truesdell
Assignee (at issue)
VXi Corporation
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.