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Class Information
Number: 181/21
Name: Acoustics > Speaking tubes > Mouthpieces
Description: Structure of the mouthpieces of speaking-tubes and the combination therewith of accessory parts, as alarms, indicators, etc.










Patents under this class:

Patent Number Title Of Patent Date Issued
8434493 Adjustable mouth shield device May. 7, 2013
6986348 Cough-a-lizer Jan. 17, 2006
6401860 Cough silencer device Jun. 11, 2002
6129173 Personal removable mouthpiece for a voice amplification instrument and method of using same Oct. 10, 2000
5877460 Device for talking underwater Mar. 2, 1999
5827173 Prenatal audio communication device Oct. 27, 1998
5493079 Vocal communication snorkel Feb. 20, 1996
4932495 Vocal sound muffling device Jun. 12, 1990
4834212 Sound muffler for covering the mouth May. 30, 1989
4792013 Vocal muffler Dec. 20, 1988
4768612 Fetal communication device Sep. 6, 1988
D297234 Fetal communication device Aug. 16, 1988
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
4423293 Microphone holding device Dec. 27, 1983











 
 
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