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Class Information
Number: 381/346
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Acoustic enclosure > Acoustic resistance
Description: Subject matter further including a material such as foam, wool, fiberglass, etc. or other sound absorbing means.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7440580 |
Room mode bass absorption through combined diaphragmatic and helmholtz resonance techniques |
Oct. 21, 2008 |
| 7269270 |
Standing wave reducing |
Sep. 11, 2007 |
| 7123735 |
Method and apparatus to increase acoustic separation |
Oct. 17, 2006 |
| 7110536 |
Acoustic seal system |
Sep. 19, 2006 |
| 6912290 |
Speaker unit for low frequency reproduction |
Jun. 28, 2005 |
| 6751330 |
Speaker system |
Jun. 15, 2004 |
| 6665413 |
Infrasonic Helmholtz resonator |
Dec. 16, 2003 |
| 6658129 |
Passive radiator having mass elements |
Dec. 2, 2003 |
| 6621910 |
Method and arrangement for improving leak tolerance of an earpiece in a radio device |
Sep. 16, 2003 |
| 6493456 |
Thin speaker assemblies including laterally offset resonator cavities and personal electronic devices including the same |
Dec. 10, 2002 |
| 6356643 |
Electro-acoustic transducer |
Mar. 12, 2002 |
| 5815589 |
Push-pull transmission line loudspeaker |
Sep. 29, 1998 |
| 5436976 |
Omni-directional stereo speaker |
Jul. 25, 1995 |
| 5369701 |
Compact loudspeaker assembly |
Nov. 29, 1994 |
| 5333204 |
Speaker system |
Jul. 26, 1994 |
| 5081674 |
Double annular ring speaker gasket |
Jan. 14, 1992 |
| 4944019 |
Low sound region reproducing speaker system |
Jul. 24, 1990 |
| 4837837 |
Loudspeaker |
Jun. 6, 1989 |
| 4799264 |
Speaker system |
Jan. 17, 1989 |
| 4665549 |
Hybrid active silencer |
May. 12, 1987 |
| 4638884 |
Chambered headrest mounting for stereophonic loudspeakers |
Jan. 27, 1987 |
| 4620317 |
Tabletop speaker assembly |
Oct. 28, 1986 |
| 4594478 |
Transmitter assembly for a telephone handset |
Jun. 10, 1986 |
| 4450930 |
Microphone with stepped response |
May. 29, 1984 |
| 4379212 |
Electro-acoustic transducer |
Apr. 5, 1983 |
| 4227051 |
Loud speaker and enclosure system |
Oct. 7, 1980 |
| 4151378 |
Electrostatic microphone with damping to improve omnidirectionality, flatten frequency response, reduce wind noise |
Apr. 24, 1979 |
| 4129754 |
Reporting device |
Dec. 12, 1978 |
| 4128738 |
Compact transmission line loudspeaker system |
Dec. 5, 1978 |
| 4073366 |
Disposable noise reducing hearing aid attachment |
Feb. 14, 1978 |
| 4069401 |
Acoustical frictional resistance construction and apparatus for manufacturing an acoustical resistance and an associated magnetic system |
Jan. 17, 1978 |
| 4057689 |
High fidelity sound reproduction system and modules thereof |
Nov. 8, 1977 |
| 4027116 |
Headphone |
May. 31, 1977 |
| 4006321 |
Transducer coupling system |
Feb. 1, 1977 |
| 4005278 |
Headphone |
Jan. 25, 1977 |
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