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Class Information
Number: 181/22
Name: Acoustics > Speaking tubes > Tubes
Description: The construction of the tubes, per se.

Patents under this class:

Patent Number Title Of Patent Date Issued
8434493 Adjustable mouth shield device May. 7, 2013
8028790 Sound projection device attachable to a user when not in use Oct. 4, 2011
7522743 High comfort sound delivery system Apr. 21, 2009
6705319 Miniature acoustical guidance and monitoring system for tube or catheter placement Mar. 16, 2004
6674870 Adjustable sound capturing device (MICTUBZ) Jan. 6, 2004
6160895 Hearing aid system with acoustical horn Dec. 12, 2000
5827173 Prenatal audio communication device Oct. 27, 1998
4926961 Hinged acoustical voice tube May. 22, 1990
4768612 Fetal communication device Sep. 6, 1988
4683587 Submersible personal stereo Jul. 28, 1987
4579193 Acoustic connector Apr. 1, 1986
4539983 Respirator speech transmitter Sep. 10, 1985
4537276 Mask/microphone system for voice actuated control Aug. 27, 1985
4527657 Tapered tube impedance matching underwater voice communicator with bubble silencer Jul. 9, 1985
4473130 Crash helmet with communication system Sep. 25, 1984
4451709 Eye glass hearing aids May. 29, 1984
4442515 Multiplex transmission medium for application in multiplex vehicle control systems Apr. 10, 1984

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