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Class Information
Number: 181/146
Name: Acoustics > Plural diaphragm sound sources > With sound-asborbing means
Description: Subject matter including sound absorbent material associated therewith for preventing undesirable effects.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7325649 |
Loudspeaker with progressively damped acoustical chamber |
Feb. 5, 2008 |
| 7320520 |
Portable multimedia projection system |
Jan. 22, 2008 |
| 6658121 |
Headphone having an adjustable localization of auditory events |
Dec. 2, 2003 |
| 6571909 |
Loudspeaker enclosure |
Jun. 3, 2003 |
| 6504938 |
Dual-chamber loudspeaker |
Jan. 7, 2003 |
| 6243477 |
Audio system with partitioned input and output compartments |
Jun. 5, 2001 |
| 6073723 |
Acoustic damping material |
Jun. 13, 2000 |
| 6015025 |
Diffuser panel with built-in speaker arrangement and methods of installation |
Jan. 18, 2000 |
| 5988314 |
Sound output system |
Nov. 23, 1999 |
| 5909014 |
Low frequency equaphase surround loudspeaker |
Jun. 1, 1999 |
| 5895896 |
Fluid coupled subwoofer acoustic enclosure system with port chamber |
Apr. 20, 1999 |
| 5815589 |
Push-pull transmission line loudspeaker |
Sep. 29, 1998 |
| 5731552 |
Speaker system with sound absorbing diaphragm |
Mar. 24, 1998 |
| 5731555 |
Loudspeaker enclosure having a low reflection/low diffraction baffle |
Mar. 24, 1998 |
| 5525767 |
High-performance sound imaging system |
Jun. 11, 1996 |
| 5514841 |
Reflex compression valve - divided chamber loudspeaker cabinet |
May. 7, 1996 |
| 5388162 |
Sound innovation speaker system |
Feb. 7, 1995 |
| 5324896 |
Audio loudspeaker system |
Jun. 28, 1994 |
| 5261006 |
Loudspeaker system comprising a helmholtz resonator coupled to an acoustic tube |
Nov. 9, 1993 |
| 5229555 |
Speaker system and TV with the same |
Jul. 20, 1993 |
| 5067159 |
Structure of a speaker apparatus |
Nov. 19, 1991 |
| 4964482 |
Loudspeaker enclosure |
Oct. 23, 1990 |
| 4944019 |
Low sound region reproducing speaker system |
Jul. 24, 1990 |
| 4924964 |
Loudspeaker enclosure |
May. 15, 1990 |
| 4905788 |
Electro-acoustic transducers |
Mar. 6, 1990 |
| 4893695 |
Speaker system |
Jan. 16, 1990 |
| 4869340 |
Very high performance loudspeaker enclosures |
Sep. 26, 1989 |
| 4850452 |
Loudspeaker structure |
Jul. 25, 1989 |
| 4837837 |
Loudspeaker |
Jun. 6, 1989 |
| 4837839 |
Compact speaker assembly with improved low frequency response |
Jun. 6, 1989 |
| 4819761 |
Tubular loudspeaker system |
Apr. 11, 1989 |
| 4805728 |
Sound system with anechoic enclosure |
Feb. 21, 1989 |
| 4802551 |
Loudspeaker unit |
Feb. 7, 1989 |
| 4799264 |
Speaker system |
Jan. 17, 1989 |
| 4690244 |
Loudspeaker enclosures |
Sep. 1, 1987 |
| 4640381 |
Wall-mounted resin speaker cabinet |
Feb. 3, 1987 |
| 4638884 |
Chambered headrest mounting for stereophonic loudspeakers |
Jan. 27, 1987 |
| 4593784 |
Loudspeaker enclosure |
Jun. 10, 1986 |
| 4591020 |
Loudspeaker enclosure with isolation of loudspeaker vibration |
May. 27, 1986 |
| 4580654 |
Portable sound speaker system |
Apr. 8, 1986 |
| 4574906 |
Outdoor speaker |
Mar. 11, 1986 |
| 4517416 |
Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam |
May. 14, 1985 |
| 4512434 |
Aerodynamic bass-reflex enclosure |
Apr. 23, 1985 |
| 4509615 |
Multi-chamber enclosure for loudspeakers |
Apr. 9, 1985 |
| 4475620 |
Loudspeaker with wall reflex absorber |
Oct. 9, 1984 |
| 4450929 |
Acoustic energy systems |
May. 29, 1984 |
| 4440259 |
Loudspeaker system for producing coherent sound |
Apr. 3, 1984 |
| 4437539 |
Speaker enclosure |
Mar. 20, 1984 |
| 4424416 |
Acoustic reproducing apparatus |
Jan. 3, 1984 |
| 4373606 |
Loudspeaker enclosure and process for generating sound radiation |
Feb. 15, 1983 |
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