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Class Information
Number: 181/168
Name: Acoustics > Diaphragm > Critically defined material or coating > Metallic material
Description: Subject matter wherein the material of which the diaphragm is made is metal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7280668 |
Ceramic metal matrix diaphragm for loudspeakers |
Oct. 9, 2007 |
| 6929092 |
Speaker diaphragm |
Aug. 16, 2005 |
| 6920230 |
Electromagnetic transducer and portable communication device |
Jul. 19, 2005 |
| 6814181 |
Electrically conductive damper device for speaker |
Nov. 9, 2004 |
| 6804371 |
Speaker having a laser vibration diaphragm |
Oct. 12, 2004 |
| 6658326 |
Noise reduction system and method |
Dec. 2, 2003 |
| 6634456 |
Vibrating diaphragm of false speaker structure |
Oct. 21, 2003 |
| 6394224 |
Structure of speaker |
May. 28, 2002 |
| 6364966 |
Method for manufacturing acoustic vibration plate |
Apr. 2, 2002 |
| 6327372 |
Ceramic metal matrix diaphragm for loudspeakers |
Dec. 4, 2001 |
| 6275598 |
Sound reproduction device |
Aug. 14, 2001 |
| 5796054 |
Loudspeaker diaphragm |
Aug. 18, 1998 |
| 5406038 |
Shielded speaker |
Apr. 11, 1995 |
| 5251188 |
Elongated-pattern sonic transducer |
Oct. 5, 1993 |
| 5135582 |
Method for forming a diaphragm and diaphragm |
Aug. 4, 1992 |
| 5080743 |
Process for preparation of a wholly carbonaceous diaphragm for acoustic equipment use |
Jan. 14, 1992 |
| 4726443 |
Diaphragm |
Feb. 23, 1988 |
| 4713277 |
Foamed metal and method of producing same |
Dec. 15, 1987 |
| 4709392 |
Dome speaker with a diaphragm having at least one elongated cut-out portion |
Nov. 24, 1987 |
| 4655316 |
Acoustic diaphragm |
Apr. 7, 1987 |
| 4518443 |
Acoustic diaphragm |
May. 21, 1985 |
| 4512435 |
Diaphragm for loudspeakers |
Apr. 23, 1985 |
| 4484383 |
Method of manufacturing a speaker diaphragm |
Nov. 27, 1984 |
| 4470479 |
Method of making metal coated foil speaker diaphragm |
Sep. 11, 1984 |
| 4461930 |
Acoustic transducer with honeycomb diaphragm |
Jul. 24, 1984 |
| 4351411 |
Speaker device |
Sep. 28, 1982 |
| 4344503 |
Diaphragm for electro-acoustic transducer |
Aug. 17, 1982 |
| 4315557 |
Diaphragm for electro-acoustic transducer |
Feb. 16, 1982 |
| 4254184 |
Vibrating member for acoustic transducer and method for manufacturing the same |
Mar. 3, 1981 |
| 4216271 |
Composite diaphragm for speaker |
Aug. 5, 1980 |
| 4135601 |
Boron coated diaphragm for use in a loud speaker |
Jan. 23, 1979 |
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