Inventor
CAMPBELL II DAVID M
US4 patents
Patents
4 patentsUS8472634B2Jun 25, 2013
Preprogrammed hearing assistance device with audiometric testing capability
SCHUMAIER DANIEL R10 citations82
US8023674B2Sep 20, 2011
Connector for hearing assistance device having reduced mechanical feedback
SCHUMAIER DANIEL R6 citations60
US8870558B2Oct 28, 2014
Earplug shaper having curved shaping surfaces
SCHUMAIER DANIEL R2 citations53
US8718307B2May 6, 2014
Hearing aid apparatus
SCHUMAIER DANIEL R0 citations39