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Class Information
Number: 381/350
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Acoustic enclosure > Front wave
Description: Subject matter in which a primary sound radiation path from a transducer"s diaphragm is vented to ambient through the housing or cavity.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7596236 |
Loudspeaker with direct emission and optimised radiation |
Sep. 29, 2009 |
| 7466837 |
Diffuser and speaker using the same |
Dec. 16, 2008 |
| 7463746 |
Narrow opening electroacoustical transducing |
Dec. 9, 2008 |
| 7416048 |
Portable terminal apparatus |
Aug. 26, 2008 |
| 7382890 |
Sound reproduction device and portable terminal apparatus |
Jun. 3, 2008 |
| 7324654 |
Arbitrary coverage angle sound integrator |
Jan. 29, 2008 |
| 7269270 |
Standing wave reducing |
Sep. 11, 2007 |
| 7068979 |
Mobile telecommunications device |
Jun. 27, 2006 |
| 6996243 |
Loudspeaker with shaped sound field |
Feb. 7, 2006 |
| 6931143 |
Thin enclosure electroacoustical transducing |
Aug. 16, 2005 |
| 6859543 |
Speaker system and method for making the same |
Feb. 22, 2005 |
| 6744902 |
Ported loudspeaker enclosure |
Jun. 1, 2004 |
| 6704425 |
System and method to enhance reproduction of sub-bass frequencies |
Mar. 9, 2004 |
| 6704426 |
Loudspeaker system |
Mar. 9, 2004 |
| 6665413 |
Infrasonic Helmholtz resonator |
Dec. 16, 2003 |
| 6625292 |
Ported loudspeaker enclosure |
Sep. 23, 2003 |
| 6493455 |
Subwoofer assembly |
Dec. 10, 2002 |
| 6389146 |
Acoustically asymmetric bandpass loudspeaker with multiple acoustic filters |
May. 14, 2002 |
| 6078676 |
Speaker system with a three-dimensional spiral sound passage |
Jun. 20, 2000 |
| 6021208 |
Hidden speaker enclosure structure |
Feb. 1, 2000 |
| 5930376 |
Multiple channel speaker system for a portable computer |
Jul. 27, 1999 |
| 5479520 |
Loudspeaker system |
Dec. 26, 1995 |
| 5461676 |
Device for improving bass reproduction in loudspeaker system with closed housings |
Oct. 24, 1995 |
| 5455867 |
Speaker apparatus and television receiver using the same |
Oct. 3, 1995 |
| 5394478 |
Low frequency sound generation system for use in vehicular passenger compartments |
Feb. 28, 1995 |
| 5361380 |
Woofer module for use in a television set |
Nov. 1, 1994 |
| 5343535 |
Loudspeaker device |
Aug. 30, 1994 |
| 5327504 |
Device to improve the bass reproduction in loudspeaker systems using closed housings |
Jul. 5, 1994 |
| 5313525 |
Acoustic apparatus with secondary quarterwave resonator |
May. 17, 1994 |
| 5287412 |
Arrangement for reproducing bass tones in a vehicle |
Feb. 15, 1994 |
| 5253301 |
Nondirectional acoustic generator and speaker system |
Oct. 12, 1993 |
| 5197103 |
Low sound loudspeaker system |
Mar. 23, 1993 |
| 5189706 |
Acoustic apparatus |
Feb. 23, 1993 |
| 5111509 |
Electric acoustic converter |
May. 5, 1992 |
| 5010977 |
Acoustic apparatus with plural resonators having different resonance frequencies |
Apr. 30, 1991 |
| 4944019 |
Low sound region reproducing speaker system |
Jul. 24, 1990 |
| 4918738 |
Structural assembly for housing an acoustical system |
Apr. 17, 1990 |
| 4870691 |
Load and dispersion cell for sound |
Sep. 26, 1989 |
| 4790408 |
Coiled exponential bass/midrange horn loudspeakers |
Dec. 13, 1988 |
| 4728933 |
Miniature dual cavity ringer |
Mar. 1, 1988 |
| 4413198 |
Piezoelectric transducer apparatus |
Nov. 1, 1983 |
| 4008374 |
Loudspeaker systems |
Feb. 15, 1977 |
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