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Class Information
Number: 181/164
Name: Acoustics > Diaphragm > Sectional diaphragm
Description: Subject matter wherein the diaphragm has areas of different material, shape or thickness which are united to form a vibratable partition.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7558399 |
Vibrating plate of dynamic microphone and method of manufacturing the same |
Jul. 7, 2009 |
| 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 |
| 7329933 |
Silicon microphone with softly constrained diaphragm |
Feb. 12, 2008 |
| 7306073 |
Electroacoustic transducer comprising a membrane with a middle area comprising stiffening grooves |
Dec. 11, 2007 |
| 6920230 |
Electromagnetic transducer and portable communication device |
Jul. 19, 2005 |
| 6857501 |
Method of forming parylene-diaphragm piezoelectric acoustic transducers |
Feb. 22, 2005 |
| 6745867 |
Loudspeaker drive unit |
Jun. 8, 2004 |
| 6672423 |
Speaker and method of assembling the speaker |
Jan. 6, 2004 |
| 6634456 |
Vibrating diaphragm of false speaker structure |
Oct. 21, 2003 |
| 6578661 |
Speaker apparatus |
Jun. 17, 2003 |
| 6513623 |
Speaker |
Feb. 4, 2003 |
| 6454046 |
Synchronous dustproof cover structure for sound membrane |
Sep. 24, 2002 |
| 6237716 |
Standard-sized vibrating diaphragm speaker structure |
May. 29, 2001 |
| 6236733 |
Loudspeaker |
May. 22, 2001 |
| 6178252 |
Electroacoustic transducer comprising a diaphragm having through portions for mounting a voice coil |
Jan. 23, 2001 |
| 6134337 |
Loudspeaker |
Oct. 17, 2000 |
| 6026929 |
High frequency radially arcuated center speaker cone with variable thickness |
Feb. 22, 2000 |
| 5847332 |
Polycarbonate-based radially arcuated speaker cone |
Dec. 8, 1998 |
| 5256837 |
Paper cone for cone type speaker |
Oct. 26, 1993 |
| 5195143 |
Acoustical ribbon transducer loudspeaker system |
Mar. 16, 1993 |
| 5103927 |
Variable pattern, collapsible, directional transducer |
Apr. 14, 1992 |
| 5025474 |
Speaker system with image projection screen |
Jun. 18, 1991 |
| 4997058 |
Sound transducer |
Mar. 5, 1991 |
| 4903308 |
Audio transducer with controlled flexibility diaphragm |
Feb. 20, 1990 |
| 4899390 |
Thin speaker having an enclosure within an open portion and a closed portion |
Feb. 6, 1990 |
| 4881617 |
Radially arcuated speaker cone |
Nov. 21, 1989 |
| 4709392 |
Dome speaker with a diaphragm having at least one elongated cut-out portion |
Nov. 24, 1987 |
| 4655316 |
Acoustic diaphragm |
Apr. 7, 1987 |
| 4512435 |
Diaphragm for loudspeakers |
Apr. 23, 1985 |
| 4056697 |
Movable diaphragm connector method flexible hinge diaphragm surround and electro-acoustic transducer with folded diaphragm with intermediate flexible portions |
Nov. 1, 1977 |
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