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Class Information
Number: 181/196
Name: Acoustics > Sound-modifying means > Within tubular means
Description: Subject matter wherein a mechanical restriction or valve is located within a sound conducting tubular member.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7610810 |
Methods for producing acoustic sources |
Nov. 3, 2009 |
| 7610991 |
Speaker and method of outputting acoustic sound |
Nov. 3, 2009 |
| 7584820 |
Acoustic radiating |
Sep. 8, 2009 |
| 7565948 |
Acoustic waveguiding |
Jul. 28, 2009 |
| 7533760 |
Noise reduction tubes |
May. 19, 2009 |
| 7497300 |
Noise reduction tubes |
Mar. 3, 2009 |
| 7350618 |
Multimedia speaker product |
Apr. 1, 2008 |
| 7311174 |
Cloth for loudspeaker diaphragm, loudspeaker diaphragm, and loudspeaker |
Dec. 25, 2007 |
| 6973994 |
Apparatus for increasing the quality of sound from an acoustic source |
Dec. 13, 2005 |
| 6549637 |
Loudspeaker with differential flow vent means |
Apr. 15, 2003 |
| 6513624 |
Loudspeaker enclosure |
Feb. 4, 2003 |
| 6450289 |
Noise attenuation device |
Sep. 17, 2002 |
| 6418229 |
Directional microphone, in particular having symmetrical directivity |
Jul. 9, 2002 |
| 6237642 |
Sealing-tight pipe with acoustic damping for the transport of gaseous fluids, and a method of producing the same |
May. 29, 2001 |
| 6199656 |
Casing for noise attenuation in a rock drilling rig |
Mar. 13, 2001 |
| 6148631 |
Silencer and air conditioner |
Nov. 21, 2000 |
| 6079515 |
Speaker enclosure |
Jun. 27, 2000 |
| 6001132 |
Preparation of aqueous solutions suitable for finishing cellulose containing textile materials |
Dec. 14, 1999 |
| 5946401 |
Linear speaker array |
Aug. 31, 1999 |
| 5872855 |
Multiple voice coil, multiple function loudspeaker |
Feb. 16, 1999 |
| 5844176 |
Speaker enclosure having parallel porting channels for mid-range and bass speakers |
Dec. 1, 1998 |
| 5802190 |
Linear speaker array |
Sep. 1, 1998 |
| 5673329 |
Omni-directional loudspeaker system |
Sep. 30, 1997 |
| 5664020 |
Compact full-range loudspeaker system |
Sep. 2, 1997 |
| 5657793 |
Vacuum cleaner hose and method for making same |
Aug. 19, 1997 |
| 5450495 |
Loudspeaker system |
Sep. 12, 1995 |
| 5353261 |
Vibrating apparatus |
Oct. 4, 1994 |
| 5294131 |
Audible arrow |
Mar. 15, 1994 |
| 5058169 |
Public address system |
Oct. 15, 1991 |
| 5032035 |
Platen roll core |
Jul. 16, 1991 |
| 5025886 |
Multi-ported and multi-directional loudspeaker system |
Jun. 25, 1991 |
| 4893695 |
Speaker system |
Jan. 16, 1990 |
| 4789044 |
Narrow directional microphone |
Dec. 6, 1988 |
| 4762150 |
Hose having orifice |
Aug. 9, 1988 |
| 4577536 |
Feed apparatus for automatic lathes |
Mar. 25, 1986 |
| 4349082 |
Acoustical damping element and method of forming same |
Sep. 14, 1982 |
| 4206831 |
Loudspeaker coupler |
Jun. 10, 1980 |
| 4189627 |
Electroacoustic transducer filter assembly |
Feb. 19, 1980 |
| 3930560 |
Damping element |
Jan. 6, 1976 |
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