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Class Information
Number: 181/144
Name: Acoustics > Plural diaphragm sound sources
Description: Subject matter including at least two separate means that can be vibrated by sound waves or produce sound waves.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5115882 |
Omnidirectional dispersion system for multiway loudspeakers |
May. 26, 1992 |
| 5086686 |
Keyboard instrument |
Feb. 11, 1992 |
| 5081683 |
Loudspeakers |
Jan. 14, 1992 |
| 5067159 |
Structure of a speaker apparatus |
Nov. 19, 1991 |
| 5058169 |
Public address system |
Oct. 15, 1991 |
| 5025885 |
Multiple chamber loudspeaker system |
Jun. 25, 1991 |
| 5012889 |
Speaker enclosure |
May. 7, 1991 |
| 4997058 |
Sound transducer |
Mar. 5, 1991 |
| 4993510 |
Mobile speaker fixing device |
Feb. 19, 1991 |
| 4991687 |
Speaker system having directivity |
Feb. 12, 1991 |
| 4984653 |
Loudspeaker arrangement |
Jan. 15, 1991 |
| 4967871 |
Body-sensible acoustic device |
Nov. 6, 1990 |
| 4965837 |
Environmentally resistant loudspeaker |
Oct. 23, 1990 |
| 4965836 |
Stereo headphone |
Oct. 23, 1990 |
| 4951270 |
Audio transducer apparatus |
Aug. 21, 1990 |
| 4945334 |
Energizing means for electronic warning apparatus |
Jul. 31, 1990 |
| 4928787 |
Mobile speaker system |
May. 29, 1990 |
| 4924963 |
Compact and efficient sub-woofer system and method for installation in structural partitions |
May. 15, 1990 |
| 4924962 |
Sound reproducing apparatus for use in vehicle |
May. 15, 1990 |
| 4924965 |
Speaker system |
May. 15, 1990 |
| 4923031 |
High output loudspeaker system |
May. 8, 1990 |
| 4923032 |
Ceiling panel sound system |
May. 8, 1990 |
| 4908601 |
Loud speaker with horizontal radiation pattern |
Mar. 13, 1990 |
| 4905788 |
Electro-acoustic transducers |
Mar. 6, 1990 |
| 4890689 |
Omnidirectional speaker system |
Jan. 2, 1990 |
| 4885782 |
Single and double symmetric loudspeaker driver configurations |
Dec. 5, 1989 |
| 4881265 |
Apex loudspeaker |
Nov. 14, 1989 |
| 4878561 |
Sound emitter |
Nov. 7, 1989 |
| 4875546 |
Loudspeaker with acoustic band-pass filter |
Oct. 24, 1989 |
| 4876723 |
Loudspeaker system |
Oct. 24, 1989 |
| 4870691 |
Load and dispersion cell for sound |
Sep. 26, 1989 |
| 4850452 |
Loudspeaker structure |
Jul. 25, 1989 |
| 4847590 |
Outdoor warning siren |
Jul. 11, 1989 |
| 4836329 |
Loudspeaker system with wide dispersion baffle |
Jun. 6, 1989 |
| 4836326 |
Optimal shadow omniphonic microphone and loudspeaker system |
Jun. 6, 1989 |
| 4815559 |
Portable loudspeaker apparatus for use in live performances |
Mar. 28, 1989 |
| 4811816 |
Symmetric double phonic diaphragm volume-enhancing device |
Mar. 14, 1989 |
| 4805729 |
Speaker enclosure |
Feb. 21, 1989 |
| 4796009 |
Electronic warning apparatus |
Jan. 3, 1989 |
| 4792978 |
Planar loudspeaker system |
Dec. 20, 1988 |
| 4790408 |
Coiled exponential bass/midrange horn loudspeakers |
Dec. 13, 1988 |
| 4778027 |
Rhythmizer |
Oct. 18, 1988 |
| 4773502 |
Enclosure for loudspeaker systems |
Sep. 27, 1988 |
| 4754852 |
Simulated rock speaker assembly |
Jul. 5, 1988 |
| 4753317 |
Trapezoidal loudspeaker enclosure |
Jun. 28, 1988 |
| 4739860 |
Ultrasonic rangefinder |
Apr. 26, 1988 |
| 4733749 |
High output loudspeaker for low frequency reproduction |
Mar. 29, 1988 |
| 4730694 |
Electro-mechanical reproduction of sound |
Mar. 15, 1988 |
| 4696369 |
Speaker and baffle system for a vehicle storage well and method of installing same |
Sep. 29, 1987 |
| 4673057 |
Geometrical transducer arrangements |
Jun. 16, 1987 |
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