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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 |
| 4266092 |
Loudspeaker system with broad image source |
May. 5, 1981 |
| 4256922 |
Stereophonic effect speaker arrangement |
Mar. 17, 1981 |
| 4249037 |
Pyramid loudspeakers with twin cross-phased mid-range speakers |
Feb. 3, 1981 |
| 4227050 |
Virtual sound source system |
Oct. 7, 1980 |
| 4227051 |
Loud speaker and enclosure system |
Oct. 7, 1980 |
| 4224469 |
Stereo speaker system |
Sep. 23, 1980 |
| 4219099 |
Acoustic reproduction transducer enclosure |
Aug. 26, 1980 |
| 4200170 |
Pyramid speaker assembly |
Apr. 29, 1980 |
| 4182931 |
360 Degree speakers |
Jan. 8, 1980 |
| 4182429 |
Loud-speaker system |
Jan. 8, 1980 |
| 4177872 |
Speaker system |
Dec. 11, 1979 |
| 4173266 |
Loudspeaker enclosure |
Nov. 6, 1979 |
| 4158400 |
Sound reproducing system |
Jun. 19, 1979 |
| 4147229 |
Vibratile mode speaker cabinet |
Apr. 3, 1979 |
| 4133975 |
Loudspeaker system with broad image source with directionality control for the tweeter |
Jan. 9, 1979 |
| 4122910 |
Omniphonic microphone and loudspeaker system |
Oct. 31, 1978 |
| 4119799 |
Critical alignment loudspeaker system |
Oct. 10, 1978 |
| 4100371 |
Loudspeaker system with phase difference compensation |
Jul. 11, 1978 |
| 4099026 |
Loudspeaker for vehicles |
Jul. 4, 1978 |
| 4083426 |
Loud speaker apparatus |
Apr. 11, 1978 |
| 4064966 |
Loudspeaker apparatus |
Dec. 27, 1977 |
| 4051919 |
High fidelity speaker enclosure |
Oct. 4, 1977 |
| 4039044 |
Low frequency electro-acoustic transducer with interconnected diaphragms interleaved with fixed diaphragms |
Aug. 2, 1977 |
| 4033430 |
Speaker enclosure |
Jul. 5, 1977 |
| 4016953 |
Push-pull transducer system |
Apr. 12, 1977 |
| 3983333 |
Loud speaker system |
Sep. 28, 1976 |
| 3976162 |
Personal speaker system |
Aug. 24, 1976 |
| 3964571 |
Acoustic system |
Jun. 22, 1976 |
| 3947635 |
Integrated stereo speaker system |
Mar. 30, 1976 |
| 3933219 |
Speaker system |
Jan. 20, 1976 |
| 3931867 |
Wide range speaker system |
Jan. 13, 1976 |
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