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Class Information
Number: 181/165
Name: Acoustics > Diaphragm > Sectional diaphragm > Concentric annular section
Description: Subject matter wherein the diaphragm has a central section which is attached to and surrounded by at least one concentric, annular portion.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7438156 |
Diaphragm, spherical-shell diaphragm and electroacoustic transducer, and method of manufacturing electroacoustic transducer |
Oct. 21, 2008 |
| 7428946 |
Suspension and electro-acoustic transducer using the suspension |
Sep. 30, 2008 |
| 7360626 |
Audio speaker with wobble free voice coil movement |
Apr. 22, 2008 |
| 6785397 |
Electro-acoustic converter |
Aug. 31, 2004 |
| 6578661 |
Speaker apparatus |
Jun. 17, 2003 |
| 6513623 |
Speaker |
Feb. 4, 2003 |
| 6095278 |
Base for holding the tweeter of a speaker |
Aug. 1, 2000 |
| 5590211 |
Microphone |
Dec. 31, 1996 |
| 5471437 |
Electrodynamic acoustic transducer |
Nov. 28, 1995 |
| 5339286 |
Composite electroacoustic transducer |
Aug. 16, 1994 |
| 5283397 |
Diaphragm for electrodynamic transducer |
Feb. 1, 1994 |
| 5027411 |
High frequency loudspeaker |
Jun. 25, 1991 |
| 4847908 |
Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
Jul. 11, 1989 |
| 4837839 |
Compact speaker assembly with improved low frequency response |
Jun. 6, 1989 |
| 4796725 |
Electrostatic transducer |
Jan. 10, 1989 |
| 4532383 |
Electroacoustic transducer having a variable thickness diaphragm |
Jul. 30, 1985 |
| 4379951 |
Electro-acoustic transducer means |
Apr. 12, 1983 |
| 4357498 |
Coaxial type multi-way planar diaphragm loudspeaker system |
Nov. 2, 1982 |
| 4320264 |
Loudspeaker with a heat resistant two-part diaphragm |
Mar. 16, 1982 |
| 4315112 |
Speaker |
Feb. 9, 1982 |
| 4225757 |
Broad band dynamic loudspeaker |
Sep. 30, 1980 |
| 4146756 |
Moving voice coil transducer with diaphragm having concentric sections of opposite curvature |
Mar. 27, 1979 |
| 4132872 |
Ribbed conical-central dome diaphragm with tapered thickness components |
Jan. 2, 1979 |
| 4064365 |
Loudspeaker assembly with restructured diaphragm including a tweeter driven by a bass amplifier |
Dec. 20, 1977 |
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