Inventor · disambiguated record
Norman P. Matzen
Also filed as: MATZEN NORMAN · MATZEN NORMAN P
8 granted patents·391 citations·filing 1989–2011
89Inventor score
Top patents by PatentIndex Score
8 records- 0197US6694034B2Transmission detection and switch system for hearing improvement applicationsETYMOTIC RES INC·Filed 2000·Granted Feb 17, 2004·194 cites·40 claims
- 0290US5131046AHigh fidelity hearing aid amplifierETYMOTIC RES INC·Filed 1989·Granted Jul 14, 1992·56 cites·27 claims
- 0384US6009311AMethod and apparatus for reducing audio interference from cellular telephone transmissionsETYMOTIC RESEARCH·Filed 1996·Granted Dec 28, 1999·84 cites·3 claims
- 0482US8750544B2Electronic earplug with transistor switching for introducing electronic control of the gain and providing audible switch indicationsKILLION MEAD C·Filed 2011·Granted Jun 10, 2014·17 cites·18 claims
- 0572US7460677B1Directional microphone array systemETYMOTIC RES INC·Filed 2000·Granted Dec 2, 2008·19 cites·5 claims
- 0661US7764801B2Directional microphone array systemETYMOTIC RES INC·Filed 2004·Granted Jul 27, 2010·9 cites·21 claims
- 0740US7697705B2High fidelity digital hearing aid and methods of programming and operating sameETYMOTIC RES INC·Filed 2002·Granted Apr 13, 2010·0 cites·20 claims
- 0839US5696833AHearing aid having externally controlled amplifier gain and method of using sameETYMOTIC RES INC·Filed 1995·Granted Dec 9, 1997·12 cites·25 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →