Matzen; Norman P.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Matzen; Norman P..The latest application filed is for "electronic earplug with transistor switching for introducing electronic control of the gain and providing audible switch indications".

Company Profile

0.7.3

Matzen; Norman P. - El Dorado Hills CA
Matzen; Norman P. - Campbell CA

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Electronic earplug with transistor switching for introducing electronic control of the gain and providing audible switch indications Grant 8,750,544 - Killion , et al. June 10, 2	2014-06-10
Electronic Earplug With Transistor Switching For Introducing Electronic Control Of The Gain And Providing Audible Switch Indications App 20110228947 - Killion; Mead C. ; et al.	2011-09-22
Directional microphone array system Grant 7,764,801 - Soede , et al. July 27, 2	2010-07-27
Directional microphone array system Grant 7,460,677 - Soede , et al. December 2, 2	2008-12-02
Directional microphone array system App 20050169487 - Soede, Willem ; et al.	2005-08-04
Transmission detection and switch system for hearing improvement applications Grant 6,694,034 - Julstrom , et al. February 17, 2	2004-02-17
Transmission detection and switch system for hearing improvement applications App 20030044033 - Julstrom, Stephen D. ; et al.	2003-03-06
Method and apparatus for reducing audio interference from cellular telephone transmissions Grant 6,009,311 - Killion , et al. December 28, 1	1999-12-28
High fidelity hearing aid amplifier Grant 5,131,046 - Killion , et al. July 14, 1	1992-07-14

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