Nathan David Butler

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Leominster, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Coaxial mid-frequency and high-frequency loudspeaker
- Patent number 7,920,712
- Issue date Apr 5, 2011
- LOUD Technologies Inc.
- Nathan David Butler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Coaxial mid-frequency and high-frequency loudspeaker
- Publication number 20060285712
- Publication date Dec 21, 2006
- Nathan David Butler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE