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Class Information
Number: 381/427
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Electromagnetic (e.g., dyynamic) > Specified diaphragm shape or structure > Critically defined material or lamination > Metal
Description: Subject matter in which the particular material is a metallic substance.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7280668 |
Ceramic metal matrix diaphragm for loudspeakers |
Oct. 9, 2007 |
| 6956953 |
Electroacoustic transducer with field replaceable diaphragm carrying two interlaced coils, without manipulating any wires |
Oct. 18, 2005 |
| 6563934 |
Mechanically tunable diaphragm using nickel titanium memory metal |
May. 13, 2003 |
| 6404897 |
Ceramic metal matrix diaphragm for loudspeakers |
Jun. 11, 2002 |
| 6327372 |
Ceramic metal matrix diaphragm for loudspeakers |
Dec. 4, 2001 |
| 6222931 |
High power acoustical transducer |
Apr. 24, 2001 |
| 5933512 |
Double cone-type loudspeaker |
Aug. 3, 1999 |
| 5212736 |
Ribbon speaker |
May. 18, 1993 |
| 5195143 |
Acoustical ribbon transducer loudspeaker system |
Mar. 16, 1993 |
| 5021613 |
Ribbon loudspeaker |
Jun. 4, 1991 |
| 4924504 |
Audio speaker |
May. 8, 1990 |
| 4709392 |
Dome speaker with a diaphragm having at least one elongated cut-out portion |
Nov. 24, 1987 |
| 4591667 |
Dome speaker with cut-out portions in the voice coil bobbin |
May. 27, 1986 |
| 4471173 |
Piston-diaphragm speaker |
Sep. 11, 1984 |
| 4471172 |
Planar diaphragm transducer with improved magnetic circuit |
Sep. 11, 1984 |
| 4395592 |
Ribbon loudspeaker |
Jul. 26, 1983 |
| 4220831 |
Intrusion sensing device |
Sep. 2, 1980 |
| 4190746 |
Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround |
Feb. 26, 1980 |
| 4001522 |
Ribbon type loudspeaker |
Jan. 4, 1977 |
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