David J. Truesdell

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Acton, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Microphone circuit with mute and keep alive function
- Patent number 6,681,020
- Issue date Jan 20, 2004
- VXI Corporation
- Costas Papopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Amplifier circuit for electret microphone with enhanced performance
- Patent number 6,580,797
- Issue date Jun 17, 2003
- VXI Corporation
- Costas Papadopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Amplifier circuit for electret microphone with enhanced performance
- Patent number 6,504,937
- Issue date Jan 7, 2003
- VXI Corporation
- Costas Papadopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electret microphone circuit with low battery disable
- Patent number 6,266,424
- Issue date Jul 24, 2001
- VXI Corporation
- Costas Papadopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Computer telephony headset amplifier
- Patent number 6,137,879
- Issue date Oct 24, 2000
- VXI Corporation
- Costas Papadopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Self configuring telephone headset amplifier
- Patent number 6,128,384
- Issue date Oct 3, 2000
- VXI Corporation
- Costas Papadopoulos
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Communication Headset Processing Multiple Audio Inputs
- Publication number 20090141906
- Publication date Jun 4, 2009
- DAVID CLARK COMPANY INCORPORATED
- David James Truesdell
- H04 - ELECTRIC COMMUNICATION TECHNIQUE