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Class Information
Number: 381/415
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Electromagnetic (e.g., dyynamic) > Magnetic circuit > Magnetic liquid
Description: Subject matter having a colloid containing magnetic particles in a region unoccupied by solid members of the magnetic circuit, such as the air gap.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7403632 |
Audio speaker utilizing an unanchored magnet for primary force generation |
Jul. 22, 2008 |
| 7386144 |
Inertial voice type coil actuator |
Jun. 10, 2008 |
| 7266214 |
Audio speaker and method for assembling an audio speaker |
Sep. 4, 2007 |
| 7248714 |
Micro-speaker and method for assembling a micro-speaker |
Jul. 24, 2007 |
| 7149323 |
Speaker |
Dec. 12, 2006 |
| 6993147 |
Low cost broad range loudspeaker and system |
Jan. 31, 2006 |
| 6868167 |
Audio speaker and method for assembling an audio speaker |
Mar. 15, 2005 |
| 6804368 |
Micro-speaker and method for assembling a micro-speaker |
Oct. 12, 2004 |
| 6654476 |
Low cost broad range loudspeaker and system |
Nov. 25, 2003 |
| 6654477 |
Receiver and method of construction |
Nov. 25, 2003 |
| 6438250 |
Method for making a conductor, or electric circuit balanced in radioelectric interference such as micro-discharge and corresponding conductor or circuit |
Aug. 20, 2002 |
| 6208743 |
Electrodynamic acoustic transducer with magnetic gap sealing |
Mar. 27, 2001 |
| 6041131 |
Shock resistant electroacoustic transducer |
Mar. 21, 2000 |
| 5894524 |
High power tweeter |
Apr. 13, 1999 |
| 5687248 |
Light weight and low magnetic leakage loudspeaker |
Nov. 11, 1997 |
| 5625699 |
Speaker device |
Apr. 29, 1997 |
| 5583945 |
Speaker with a molded plastic frame including a positioning projection, and a method for manufacturing the same |
Dec. 10, 1996 |
| 5524151 |
Electroacoustic transducer having a mask |
Jun. 4, 1996 |
| 5335287 |
Loudspeaker utilizing magnetic liquid suspension of the voice coil |
Aug. 2, 1994 |
| 5216723 |
Permanent magnet transducing |
Jun. 1, 1993 |
| 4914750 |
Sound transducer |
Apr. 3, 1990 |
| 4414437 |
Moving coil dynamic transducer |
Nov. 8, 1983 |
| 4320263 |
Dynamic transducer with moving coil in an air gap filled with magnetic liquid |
Mar. 16, 1982 |
| 4303806 |
Dynamic electroacoustic transducer having a moving coil in an air gap filled with a magnetic liquid |
Dec. 1, 1981 |
| 4017694 |
Method for making loudspeaker with magnetic fluid enveloping the voice coil |
Apr. 12, 1977 |
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