David M. Campbell, II

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Johnson City, TN, US

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Patents Grantslast 30 patents

Information Patent Grant
Connector for hearing assistance device having reduced mechanical f...
- Patent number 8,023,674
- Issue date Sep 20, 2011
- Daniel R. Schumaier
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
EARPLUG SHAPER HAVING CURVED SHAPING SURFACES
- Publication number 20130011509
- Publication date Jan 10, 2013
- Daniel R. Schumaier
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
HEARING AID APPARATUS
- Publication number 20120230529
- Publication date Sep 13, 2012
- Daniel R. Schumaier
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PREPROGRAMMED HEARING ASSISTANCE DEVICE WITH AUDIOMETRIC TESTING CA...
- Publication number 20100158262
- Publication date Jun 24, 2010
- Daniel R. Schumaier
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CONNECTOR FOR HEARING ASSISTANCE DEVICE HAVING REDUCED MECHANICAL F...
- Publication number 20100067725
- Publication date Mar 18, 2010
- Daniel R. Schumaier
- H04 - ELECTRIC COMMUNICATION TECHNIQUE