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Class Information
Number: 381/182
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Plural or compound reproducers
Description: Subject matter having a plurality of sound producing transducer having two or more elements performing the same or similar functions.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5117465 |
Earphone with adjustable headband with progressively shallow detents |
May. 26, 1992 |
| 5097514 |
Equilateral tetrahedral speaker system |
Mar. 17, 1992 |
| 5091958 |
Wiring structure of loudspeaker |
Feb. 25, 1992 |
| 5081683 |
Loudspeakers |
Jan. 14, 1992 |
| 5073946 |
Thin speaker having an enclosure with an open portion and a closed portion |
Dec. 17, 1991 |
| 5062139 |
Coaxial loud speaker system |
Oct. 29, 1991 |
| 5018206 |
Network mounting device for coaxial type speaker |
May. 21, 1991 |
| 5004067 |
Cinema sound system for unperforated screens |
Apr. 2, 1991 |
| 4989254 |
Electro-acoustic transducer and manufacturing process |
Jan. 29, 1991 |
| 4969197 |
Piezoelectric speaker |
Nov. 6, 1990 |
| 4969196 |
Speaker and horn array |
Nov. 6, 1990 |
| 4967871 |
Body-sensible acoustic device |
Nov. 6, 1990 |
| 4953223 |
Speaker mounting system |
Aug. 28, 1990 |
| 4942617 |
Earphone cord take-up device |
Jul. 17, 1990 |
| 4940108 |
Open line source speaker system |
Jul. 10, 1990 |
| 4914750 |
Sound transducer |
Apr. 3, 1990 |
| 4908601 |
Loud speaker with horizontal radiation pattern |
Mar. 13, 1990 |
| 4899390 |
Thin speaker having an enclosure within an open portion and a closed portion |
Feb. 6, 1990 |
| 4885782 |
Single and double symmetric loudspeaker driver configurations |
Dec. 5, 1989 |
| 4882760 |
Sound reproduction system |
Nov. 21, 1989 |
| 4876723 |
Loudspeaker system |
Oct. 24, 1989 |
| 4862508 |
Method for large-scale multiple source sound reinforcement |
Aug. 29, 1989 |
| 4837839 |
Compact speaker assembly with improved low frequency response |
Jun. 6, 1989 |
| 4821330 |
Wide-band loudspeaker having a diaphragm area divided into sub-areas for various frequency ranges |
Apr. 11, 1989 |
| 4821331 |
Coaxial speaker unit |
Apr. 11, 1989 |
| 4819761 |
Tubular loudspeaker system |
Apr. 11, 1989 |
| 4815560 |
Microphone with frequency pre-emphasis |
Mar. 28, 1989 |
| 4811406 |
Compound speaker system |
Mar. 7, 1989 |
| 4807294 |
Piezoelectric and foam resin sheet speaker |
Feb. 21, 1989 |
| 4742548 |
Unidirectional second order gradient microphone |
May. 3, 1988 |
| 4727586 |
High fidelity speaker system and assembly |
Feb. 23, 1988 |
| 4720868 |
Dynamic transducer device |
Jan. 19, 1988 |
| 4672675 |
Multiple speaker loudspeaker with conductive bridge |
Jun. 9, 1987 |
| 4665550 |
Electrodynamic loudspeaker having omnidirectional sound emission |
May. 12, 1987 |
| 4653606 |
Electroacoustic device with broad frequency range directional response |
Mar. 31, 1987 |
| 4653103 |
Loudspeaker structure and system |
Mar. 24, 1987 |
| 4590333 |
Multidriver loudspeaker |
May. 20, 1986 |
| 4574906 |
Outdoor speaker |
Mar. 11, 1986 |
| 4565905 |
Loudspeaker construction |
Jan. 21, 1986 |
| 4553630 |
Speaker with tweeter angle adjusting device |
Nov. 19, 1985 |
| 4554414 |
Multi-driver loudspeaker |
Nov. 19, 1985 |
| 4552242 |
Coaxial type composite loudspeaker |
Nov. 12, 1985 |
| 4535870 |
Quick attach-detach mechanism for audio components |
Aug. 20, 1985 |
| 4502149 |
Multi-purpose interchangeable modular auto loudspeaker system |
Feb. 26, 1985 |
| 4497981 |
Multi-driver loudspeaker |
Feb. 5, 1985 |
| 4492826 |
Loudspeaker |
Jan. 8, 1985 |
| 4475014 |
Acoustical transducer |
Oct. 2, 1984 |
| 4462112 |
Speaker system |
Jul. 24, 1984 |
| 4451928 |
Multi-speaker system for use in automobiles |
May. 29, 1984 |
| 4447678 |
Electracoustic transducer |
May. 8, 1984 |
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