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Norman P. Matzen
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El Dorado Hills, CA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Electronic earplug with transistor switching for introducing electr...
Patent number
8,750,544
Issue date
Jun 10, 2014
Etymotic Research, Inc.
Mead C. Killion
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Directional microphone array system
Patent number
7,764,801
Issue date
Jul 27, 2010
Etymotic Research Inc.
Willem Soede
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
High fidelity digital hearing aid and methods of programming and op...
Patent number
7,697,705
Issue date
Apr 13, 2010
Etymotic Research, Inc.
Mead C. Killion
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Directional microphone array system
Patent number
7,460,677
Issue date
Dec 2, 2008
Etymotic Research Inc.
Willem Soede
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Transmission detection and switch system for hearing improvement ap...
Patent number
6,694,034
Issue date
Feb 17, 2004
Etymotic Research, Inc.
Stephen D. Julstrom
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for reducing audio interference from cellular...
Patent number
6,009,311
Issue date
Dec 28, 1999
Etymotic Research
Mead C. Killion
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Hearing aid having externally controlled amplifier gain and method...
Patent number
5,696,833
Issue date
Dec 9, 1997
Etymotic Research, Inc.
Norman P. Matzen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
High fidelity hearing aid amplifier
Patent number
5,131,046
Issue date
Jul 14, 1992
Etymotic Research Inc.
Mead C. Killion
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
ELECTRONIC EARPLUG WITH TRANSISTOR SWITCHING FOR INTRODUCING ELECTR...
Publication number
20110228947
Publication date
Sep 22, 2011
Etymotic Research, Inc.
Mead C. Killion
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
Directional microphone array system
Publication number
20050169487
Publication date
Aug 4, 2005
Willem Soede
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
High fidelity digital hearing aid and methods of programming and op...
Publication number
20030086581
Publication date
May 8, 2003
Mead C. Killion
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Transmission detection and switch system for hearing improvement ap...
Publication number
20030044033
Publication date
Mar 6, 2003
Stephen D. Julstrom
H04 - ELECTRIC COMMUNICATION TECHNIQUE