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| Number | Title | Issue Date |
| 4251807 | Miniature buzzer A miniature buzzer for a pocket pager and the like is provided. The buzzer includes a support member in the form of a cylindrical collar having a bore extending therethrough. The bore is stepped with the step defining a knife edge. A pole piece surrounded... | 02/17/1981 |
| 4191863 | Support for multi-point magnetic driver loudspeaker A dynamic loudspeaker of the plane vibrating-plate, multi-point drive type has a support structure in the rear of the plane plate or diaphragm supporting the forward ends of a plurality of magnetic drivers to a frame. Connecting arms and diagonal connecti... | 03/04/1980 |
| 4143537 | Method for the manufacture of loud speakers A method for the manufacture of loud speakers of the type comprising in particular a pot for containing a magnet, which method is characterized in that the pot is made in one single piece by pressing and, to this end, a concave blank is formed; it is then... | 03/13/1979 |
| 4122314 | Loudspeaker having a laminate diaphragm of three layers A loudspeaker having a diaphragm including first and second layers and a core sandwiched between the layers, the core being firmly secured to the inner surface of each layer so as to form a unitary structure therewith, a drive assembly causes the diaphrag... | 10/24/1978 |
| 4027111 | Ribbon loudspeaker A ribbon loudspeaker comprises, in accordance with the invention, permanent magnets constituting a disconnected magnetic system and sound reproducing ribbons freely vibrating independently of one another positioned in the gap between the poles of the perm... | 05/31/1977 |
| 4013846 | Piston loudspeaker An electroacoustic loudspeaker having a rigid, light-weight diaphragm and a substantially closed loop magnet support of a magnetically permeable material having a channel-shaped cross-section and supported adjacent and spaced from the diaphragm with the o... | 03/22/1977 |
| 4010334 | Moving magnet contact acoustic transducer A dynamic acoustic transducer device of small, compact, highly efficient design, wherein a vibratable diaphragm is supported in an open side of a casing, a pair of permanent magnets being secured to the diaphragm for vibrational movement therewith, the ma... | 03/01/1977 |
| 4000381 | Moving magnet transducer A miniature acoustical transducer. The transducer includes a diaphragm, spring member and electromagnetic coils secured within a substantially cylindrical housing. The coils are arranged on opposite sides of the spring member. The spring member carries a ... | 12/28/1976 |
