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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 |
| 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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